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Original Articles
Decomposition of socioeconomic inequalities in glaucoma knowledge in Taiwan
Chiun-Ho Hou, Christy Pu
Epidemiol Health. 2024;46:e2024004.   Published online December 5, 2023
DOI: https://doi.org/10.4178/epih.e2024004
  • 4,696 View
  • 104 Download
AbstractAbstract AbstractSummary PDF
Abstract
OBJECTIVES
Glaucoma knowledge is strongly associated with medication adherence and preventive behavior. Studies have frequently reported socioeconomic inequalities in glaucoma knowledge. This study aimed to decompose such inequalities. Decomposition analysis enables the design of policies directly targeting the underlying causes of inequality.
METHODS
We performed a cross-sectional survey from January 1, 2019 to June 30, 2019, at the departments of ophthalmology of 2 medical centers belonging to a hospital chain in northern Taiwan. Socioeconomic inequalities in glaucoma knowledge were ranked based on 3 aspects of socioeconomic status (SES): (1) education, (2) income, and (3) self-perceived financial status. The concentration index was calculated and decomposed using decomposition analysis. Elasticity and marginal effects were estimated for each decomposed factor.
RESULTS
In total, 1,203 patients completed the survey. Both measures of glaucoma knowledge and overall glaucoma knowledge score significantly contributed to the progressivity of knowledge inequalities (pro-high-SES inequalities). The concentration index for overall knowledge score with respect to education was 0.166 (p<0.001). Both objective and subjective measures of SES were associated with pro-high-SES inequalities. Our decomposition analysis revealed that demographic factors and attitudinal factors such as the level of concern regarding developing glaucoma contributed significantly to SES-based inequalities in glaucoma knowledge.
CONCLUSIONS
Our decomposition analysis provided empirical evidence regarding the underlying causes of SES-based inequalities in glaucoma knowledge. Efforts to improve glaucoma knowledge should consider specific factors that drive SES-based inequalities, such as age, sex, and concern about vision health, to ultimately achieve low SES-based inequalities.
Summary
Key Message
This study investigates the relationship between glaucoma knowledge and socioeconomic status (SES) inequalities, and the underlying causes of these disparities. The study concludes that understanding the drivers of SES-based inequalities in glaucoma knowledge, like age, gender, and concerns about vision health, is crucial. This understanding can guide efforts to improve glaucoma awareness and address SES-based disparities in knowledge, aiming to reduce these inequalities.
Regional disparities in the availability of cancer clinical trials in Korea
Jieun Jang, Wonyoung Choi, Sung Hoon Sim, Sokbom Kang
Epidemiol Health. 2024;46:e2024006.   Published online December 11, 2023
DOI: https://doi.org/10.4178/epih.e2024006
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AbstractAbstract AbstractSummary PDFSupplementary Material
Abstract
OBJECTIVES
Unequal access to cancer clinical trials is an important issue, given the potential benefits of participation for cancer patients. We evaluated regional disparities in access to cancer clinical trials in Korea.
METHODS
From the Ministry of Food and Drug Safety database, we extracted 2,465 records of all cancer clinical trials approved between January 2012 and April 2023. To measure disparities in cancer clinical trial access, we calculated the ratio of clinical trials open to non-capital areas relative to those open to capital areas. We then analyzed temporal trends in this ratio, which we termed the trial geographical equity index (TGEI).
RESULTS
Disparities in access to cancer clinical trials, as indicated by the TGEI, did not significantly improve during the study period (regression coefficient, 0.002; p=0.59). However, for phase II/III trials sponsored by global pharmaceutical companies, the TGEI improved significantly (regression coefficient, 0.021; p<0.01). In contrast, the TGEI deteriorated for trials initiated by investigators or those testing domestically developed therapeutics (regression coefficient, -0.015; p=0.05). Furthermore, the increasing trend of TGEI for phase II/III trials sponsored by global companies began to reverse after 2019, coinciding with the outbreak of coronavirus disease 2019 (COVID-19).
CONCLUSIONS
Over the past decade, access to cancer clinical trials has improved in Korea, particularly for phase II/III trials evaluating therapeutics from global companies. However, this increase in accessibility has not extended to trials initiated by investigators or those assessing domestically developed therapeutics. Additionally, the impact of COVID-19 on disparities in clinical trial access should be closely monitored.
Summary
Korean summary
본 연구는 개시된 암 임상시험 수가 국내 수도권에 비해 비수도권에서 절대적으로 부족하고, 이러한 부족이 지난 10년간 개선되지 않았음을 보여줍니다. 다만, 글로벌 제약회사의 치료제를 검증하는 2상/3상 암 임상시험의 경우 임상시험 접근성에 대한 이러한 지역적 격차가 의미 있게 감소했으나 이러한 개선 또한 2019년 이후로는 정체되었을 수 있습니다. 상기 결과들은 임상시험 가용성의 형평성을 향상시키기 위해서는 국내 임상시험 개시 규모가 지역적 불균형을 이루고 있음에 대한 인식이 높아져야 하고, 비수도권 지역에서 임상시험 개시를 방해하는 장벽을 식별하는 데 추가적인 노력이 필요함을 강조합니다.
Key Message
The findings in this study indicate scarcity of cancer clinical trials in non-capital areas compared to that in capital areas of Korea, which has not improved over the past decade. However, this regional disparity in the access to clinical trials meaningfully decreased for phase II/III trials testing therapeutics from global pharmaceutical companies, though this progress may have stalled after 2019. This study highlights that increasing awareness of the regional imbalance in clinical trial access is vital and further efforts are needed to identify the barriers impeding the initiation of clinical trials in non-capital areas to improve the equity of availability.
Folate, vitamin B12, and homocysteine status in the Korean population: data from the 2013-2015 Korea National Health and Nutrition Examination Survey
Sihan Song, Bo Mi Song, Hyun-Young Park
Epidemiol Health. 2024;46:e2024007.   Published online December 11, 2023
DOI: https://doi.org/10.4178/epih.e2024007
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AbstractAbstract AbstractSummary PDFSupplementary Material
Abstract
OBJECTIVES
We aimed to assess the serum folate, vitamin B12, and homocysteine status in Korean adolescents and adults using national data.
METHODS
Blood samples were collected from participants aged ≥10 years in the Korea National Health and Nutrition Examination Survey 2013-2015. The stored serum samples were used to measure folate, vitamin B12, and homocysteine concentrations. A total of 8,016 participants were included in this analysis. Unweighted descriptive statistics and adjusted geometric means of the B vitamins and homocysteine concentrations were estimated.
RESULTS
Females had higher serum folate and vitamin B12 concentrations and lower serum homocysteine concentrations than males. Folate deficiency (<6.8 nmol/L) and hyperhomocysteinemia (>15 μmol/L) were found in 8.6% and 11.8% of males, respectively. Approximately 3% of males had low or marginally low vitamin B12 status (≤221 pmol/L). Folate and vitamin B12 deficiencies and hyperhomocysteinemia were found in <2% of females. Suboptimal folate status was prevalent among adolescents and young adults, while suboptimal vitamin B12 status and hyperhomocysteinemia were relatively higher in older adults. Adjusted mean homocysteine concentrations were sharply decreased from the first to second decile of serum folate in males.
CONCLUSIONS
In the Korean population, the proportion of males who achieved desirable folate and homocysteine concentrations were lower than those of females. Although most Koreans have adequate vitamin B12, a suboptimal folate status is common, particularly among adolescents and young adults. These findings could establish a foundation for public health initiatives aimed at improving folate levels in the Korean population.
Summary
Korean summary
엽산과 비타민B12는 전 생애에 걸쳐 건강에 영향을 미치는 필수 비타민이다. 그러나 해당 비타민 상태에 대한 국내 자료는 부족한 실정이다. 본 연구는 국민건강영양조사 참여자로부터 수집된 혈청으로부터 엽산, 비타민B12, 그리고 이들의 기능성 지표인 호모시스테인 농도를 측정하였고 성별과 연령별 분포와 적합 상태를 평가하였다. 엽산 결핍과 고호모시스테인혈증은 남성에서 높은 유병률을 가졌다. 적정 엽산 상태를 충족하지 못하는 비율은 청소년과 젊은 성인에서 흔하게 관찰되었다. 대부분의 한국인은 충분한 비타민B12 수준을 가졌으나, 노인의 경우 정기적인 평가가 필요하다. 본 연구는 한국인이 최적의 엽산과 비타민B12 상태를 유지하기 위한 기반적 근거를 제공한다.
Key Message
Folate and vitamin B12 have significant health impacts throughout the life cycle. However, national-level data on B vitamins in Korea are limited. Serum folate, vitamin B12, and homocysteine concentrations were measured from samples stored during the national survey. In our study, the proportions of folate deficiency and hyperhomocysteinemia were higher in men than in women.Suboptimal folate status was common among adolescents and young adults. Most Koreans had adequate levels of vitamin B12; however, regular monitoring is warranted, especially in the older population. The current data provide a future direction for achieving optimal B vitamin status in the Korean population.
Validation of the Korean Academy of Geriatric Dentistry screening questionnaire and oral frailty diagnostic criteria in community-dwelling older adults
Jeong-Hyun Kang, Seong-Chan Park, Hoi-In Jung, Sun Jae Jung, Hye-Jin Park, Soo-Min Kim, Min-Ji Jo, Yun-Seon Lee, Sun-Young Han
Epidemiol Health. 2024;46:e2024008.   Published online December 11, 2023
DOI: https://doi.org/10.4178/epih.e2024008
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AbstractAbstract AbstractSummary PDFSupplementary Material
Abstract
OBJECTIVES
This study aimed to establish the validity—specifically, the sensitivity and specificity—of the screening questionnaire and diagnostic criteria for oral frailty proposed by the Korean Academy of Geriatric Dentistry (KAGD) among community-dwelling older adults.
METHODS
This study enrolled 100 participants. Among various definitions of oral frailty, this study used the criteria proposed by Tanaka as the reference test. The screening questionnaire consisted of 11 items for screening physical frailty, chewing ability, swallowing difficulties, oral dryness, and tongue and lip motor function. Each question had a different scoring weight, and if the total score was 1 or higher, an oral frailty diagnostic examination proposed by the KAGD would be recommended. The diagnostic test was the oral frailty diagnostic criteria proposed by the KAGD including 6 measures: chewing ability, occlusal force, tongue pressure, oral dryness, swallowing difficulty, and oral hygiene. If a participant exhibited 2 or more positive measures, this participant was classified as “oral frail.” The screening questionnaire was analyzed using a cut-off value of 1 or higher, while the diagnostic criteria utilized a cut-off of 2 or more positive measures. Sensitivity and specificity were calculated.
RESULTS
The screening questionnaire showed significant power for screening oral frailty (area under the receiver operating characteristic curve, 0.783; sensitivity, 87.8%; specificity, 52.5%). The diagnostic accuracy of the newly proposed diagnostic criteria was acceptable (sensitivity, 95.1%; specificity, 42.4%).
CONCLUSIONS
The newly proposed screening questionnaire and diagnostic criteria in Korea appear to be a useful tool to identify oral frailty in community-dwelling older adults.
Summary
Korean summary
본 연구는 지역사회에 거주하는 노인들의 구강 노쇠에 대한 선별검사 설문지와 진단 기준을 검증하는 것을 목표로 했습니다. 민감도와 특이도가 계산되었으며, 스크리닝 설문지는 구강 노쇠를 식별하는 데 상당한 힘을 보여주었고(민감도 87.8%, 특이도 52.5%), 진단 기준은 수용 가능한 정확도(민감도 95.1%, 특이도 42.4%)를 나타냈습니다. 연구 결과는 제안된 선별 설문지와 진단 기준이 한국 지역사회에 거주하는 노인들의 구강 노쇠를 식별하는 데 유용한 도구임을 시사합니다.
Key Message
This study aimed to validate a screening questionnaire and diagnostic criteria for oral frailty among older adults living in the community. Sensitivity and specificity were calculated, with the screening questionnaire demonstrating a significant power for identifying oral frailty (sensitivity 87.8%, specificity 52.5%) and the diagnostic criteria showing acceptable accuracy (sensitivity 95.1%, specificity 42.4%). The findings suggest that the proposed screening questionnaire and diagnostic criteria are valuable tools for identifying oral frailty in community-dwelling older adults in Korea.
The association between migraine and Parkinson’s disease: a nationwide cohort study in Korea
Woo-Seok Ha, Jaeho Kim, Hee Won Hwang, Sue Hyun Lee, Ji In Kim, Jin Yong Hong, Sang Hyun Park, Kyung Do Han, Min Seok Baek
Epidemiol Health. 2024;46:e2024010.   Published online December 18, 2023
DOI: https://doi.org/10.4178/epih.e2024010
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AbstractAbstract AbstractSummary PDFSupplementary Material
Abstract
OBJECTIVES
Clinical studies have suggested an association between migraine and the occurrence of Parkinson’s disease (PD). However, it is unknown whether migraine affects PD risk. We aimed to investigate the incidence of PD in patients with migraine and to determine the risk factors affecting the association between migraine and PD incidence.
METHODS
Using the Korean National Health Insurance System database (2002-2019), we enrolled all Koreans aged ≥40 years who participated in the national health screening program in 2009. International Classification of Diseases (10th revision) diagnostic codes and Rare Incurable Diseases System diagnostic codes were used to define patients with migraine (within 12 months of enrollment) and newly diagnosed PD.
RESULTS
We included 214,193 patients with migraine and 5,879,711 individuals without migraine. During 9.1 years of follow-up (55,435,626 person-years), 1,973 (0.92%) and 30,664 (0.52%) individuals with and without migraine, respectively, were newly diagnosed with PD. Following covariate adjustment, patients with migraine showed a 1.35-fold higher PD risk than individuals without migraine. The incidence of PD was not significantly different between patients with migraine with aura and those without aura. In males with migraine, underlying dyslipidemia increased the risk of PD (p=0.012). In contrast, among females with migraine, younger age (<65 years) increased the risk of PD (p=0.038).
CONCLUSIONS
Patients with migraine were more likely to develop PD than individuals without migraine. Preventive management of underlying comorbidities and chronic migraine may affect the incidence of PD in these patients. Future prospective randomized clinical trials are warranted to clarify this association.
Summary
Korean summary
편두통 환자들은 편두통이 없는 이들보다 장기적으로 파킨슨병이 발병할 위험이 더 높습니다. 더불어, 이 관계는 편두통의 아형(전조 vs. 무전조)보다는 편두통의 빈도(삽화성 vs. 만성)와 더 밀접한 연관성을 갖는 것으로 보입니다.
Key Message
Patients with migraine are more likely to develop Parkinson’s disease than individuals without migraine. Furthermore, this association appears to be more strongly linked to the frequency of migraines (episodic vs. chronic) rather than the subtype of migraine (with aura vs. without aura).
Smoking-attributable mortality among Korean adults in 2019
Yeun Soo Yang, Keum Ji Jung, Heejin Kimm, Sunmi Lee, Sun Ha Jee
Epidemiol Health. 2024;46:e2024011.   Published online December 19, 2023
DOI: https://doi.org/10.4178/epih.e2024011
  • 2,420 View
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AbstractAbstract AbstractSummary PDF
Abstract
OBJECTIVES
Tobacco use ranks among the leading preventable causes of death worldwide. This study was conducted to calculate the mortality rate attributable to smoking in Korea for 2019 and to highlight the importance of tracking and monitoring smoking-related deaths for public health purposes.
METHODS
Population attributable risk (PAR) was used to estimate the number of deaths related to smoking in 2019. PAR percentages were applied to the estimated mortality figures for various diseases, with PAR determined based on relative risk (RR). Levin’s formula was used to calculate PAR, and RR was adjusted for age and alcohol consumption using Cox proportional hazards regression model to derive disease-specific regression coefficients. The analysis incorporated previously determined smoking rates from 1985, and use rates of novel tobacco products were not considered.
RESULTS
The findings revealed a total of 67,982 smoking-attributable deaths in Korea in 2019, 56,993 of which occurred in men and 11,049 in women. The PAR of smoking for various causes of death in adult men was highest for lung cancer at 74.9%, followed by pneumonia (29.4%), ischemic heart disease (42.3%), and stroke (30.2%). For women, the PAR for smoking-related death was highest for lung cancer (19.9%), followed by stroke (7.6%), pneumonia (5.7%), and ischemic heart disease (9.1%).
CONCLUSIONS
In countries experiencing rapid fluctuations in smoking rates, including Korea, regular studies on smoking-related mortality is imperative. Furthermore, it is necessary to investigate smoking-related deaths, including the prevalence of novel tobacco product use, to accurately gauge the risks associated with emerging tobacco products.
Summary
Korean summary
이 연구는 2019년 한국에서 흡연으로 인한 사망률을 계산하고 공중 보건 목적을 위한 흡연 관련 사망추적 및 모니터링의 중요성을 강조합니다. 연구 결과, 2019년 한국에서 흡연으로 인해 총 67,982명이 사망했으며, 이 중 남성이 56,993명, 여성이 11,049명이었습니다. 특히 남성의 경우 폐암(74.9%), 여성의 경우 폐암(19.9%)에서 흡연으로 인한 사망 위험이 가장 높게 나타났습니다.
Key Message
This study analyzed deaths attributable to smoking in Korea in 2019, revealing that a total of 67,982 individuals lost their lives due to smoking. Among these, 56,993 were men and 11,049 were women, with the highest smoking-related mortality rate observed in men due to lung cancer at 74.9%, and in women due to lung cancer at 19.9%. Through these findings, this research emphasizes the importance of tracking and monitoring smoking-related deaths for public health.
Identifying pregnancy episodes and estimating the last menstrual period using an administrative database in Korea: an application to patients with systemic lupus erythematosus
Yu-Seon Jung, Yeo-Jin Song, Jihyun Keum, Ju Won Lee, Eun Jin Jang, Soo-Kyung Cho, Yoon-Kyoung Sung, Sun-Young Jung
Epidemiol Health. 2024;46:e2024012.   Published online December 19, 2023
DOI: https://doi.org/10.4178/epih.e2024012
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  • 1 Web of Science
AbstractAbstract AbstractSummary PDFSupplementary Material
Abstract
OBJECTIVES
This study developed an algorithm for identifying pregnancy episodes and estimating the last menstrual period (LMP) in an administrative claims database and applied it to investigate the use of pregnancy-incompatible immunosuppressants among pregnant women with systemic lupus erythematosus (SLE).
METHODS
An algorithm was developed and applied to a nationwide claims database in Korea. Pregnancy episodes were identified using a hierarchy of pregnancy outcomes and clinically plausible periods for subsequent episodes. The LMP was estimated using preterm delivery, sonography, and abortion procedure codes. Otherwise, outcome-specific estimates were applied, assigning a fixed gestational age to the corresponding pregnancy outcome. The algorithm was used to examine the prevalence of pregnancies and utilization of pregnancy-incompatible immunosuppressants (cyclophosphamide [CYC]/mycophenolate mofetil [MMF]/methotrexate [MTX]) and non-steroidal anti-inflammatory drugs (NSAIDs) during pregnancy in SLE patients.
RESULTS
The pregnancy outcomes identified in SLE patients included live births (67%), stillbirths (2%), and abortions (31%). The LMP was mostly estimated with outcome-specific estimates for full-term births (92.3%) and using sonography procedure codes (54.7%) and preterm delivery diagnosis codes (37.9%) for preterm births. The use of CYC/MMF/MTX decreased from 7.6% during preconception to 0.2% at the end of pregnancy. CYC/MMF/MTX use was observed in 3.6% of women within 3 months preconception and 2.5% during 0-7 weeks of pregnancy.
CONCLUSIONS
This study presents the first pregnancy algorithm using a Korean administrative claims database. Although further validation is necessary, this study provides a foundation for evaluating the safety of medications during pregnancy using secondary databases in Korea, especially for rare diseases.
Summary
Korean summary
임산부의 약물 사용 안전성에 대한 근거 제공을 위해 실제 인구집단에서의 임신 중 약물 치료 안전성을 평가하는 청구자료 기반 연구가 중요하다. 본 연구에서는 국내 청구자료에 적용할 수 있는 임신 정의 및 임신 결과 조작적 정의 알고리즘을 개발하였다. 본 알고리즘은 임신 결과 간의 우선순위를 고려한 계층 구조를 활용하며, 조기 분만 및 초음파 검사 코드 등을 통해 최종 월경 기간을 추정하였다. 또한 알고리즘을 전신홍반루푸스 환자에 적용하여 유산, 사산 등의 유병률을 산출하고 임신 중 잠재적으로 부적절한 면역억제제 사용을 파악하여 국내 청구자료의 특성을 고려한 임신 중 약물 사용 연구의 기반을 마련하였다.
Key Message
Limited safety data for pregnant women prompted recent studies on medication during pregnancy using real-world databases. This study developed a tailored algorithm for Korean healthcare claims database, employing a hierarchy of pregnancy outcomes and incorporating pre-term delivery and sonography codes for last menstrual period estimation. Applied to systemic lupus erythematosus (SLE) patients, this study presented the prevalence and drug utilization pattern of pregnancy-incompatible immunosuppressants from preconception to pregnancy end, laying a foundation for further claims database studies on medication pregnancy safety.
Special Articles
Identification of acute myocardial infarction and stroke events using the National Health Insurance Service database in Korea
Minsung Cho, Hyeok-Hee Lee, Jang-Hyun Baek, Kyu Sun Yum, Min Kim, Jang-Whan Bae, Seung-Jun Lee, Byeong-Keuk Kim, Young Ah Kim, JiHyun Yang, Dong Wook Kim, Young Dae Kim, Haeyong Pak, Kyung Won Kim, Sohee Park, Seng Chan You, Hokyou Lee, Hyeon Chang Kim
Epidemiol Health. 2024;46:e2024001.   Published online December 26, 2023
DOI: https://doi.org/10.4178/epih.e2024001
  • 6,729 View
  • 146 Download
  • 1 Crossref
AbstractAbstract AbstractSummary PDF
Abstract
OBJECTIVES
The escalating burden of cardiovascular disease (CVD) is a critical public health issue worldwide. CVD, especially acute myocardial infarction (AMI) and stroke, is the leading contributor to morbidity and mortality in Korea. We aimed to develop algorithms for identifying AMI and stroke events from the National Health Insurance Service (NHIS) database and validate these algorithms through medical record review.
METHODS
We first established a concept and definition of “hospitalization episode,” taking into account the unique features of health claims-based NHIS database. We then developed first and recurrent event identification algorithms, separately for AMI and stroke, to determine whether each hospitalization episode represents a true incident case of AMI or stroke. Finally, we assessed our algorithms’ accuracy by calculating their positive predictive values (PPVs) based on medical records of algorithm-identified events.
RESULTS
We developed identification algorithms for both AMI and stroke. To validate them, we conducted retrospective review of medical records for 3,140 algorithm-identified events (1,399 AMI and 1,741 stroke events) across 24 hospitals throughout Korea. The overall PPVs for the first and recurrent AMI events were around 92% and 78%, respectively, while those for the first and recurrent stroke events were around 88% and 81%, respectively.
CONCLUSIONS
We successfully developed algorithms for identifying AMI and stroke events. The algorithms demonstrated high accuracy, with PPVs of approximately 90% for first events and 80% for recurrent events. These findings indicate that our algorithms hold promise as an instrumental tool for the consistent and reliable production of national CVD statistics in Korea.
Summary
Key Message
In this study, we developed algorithms to identify acute myocardial infarction (AMI) and stroke events from the Korean National Health insurance Service database. To validate them, we conducted retrospective review of medical records across 24 hospitals throughout Korea. The overall positive predictive values for the first and recurrent AMI events were around 92% and 78%, respectively, while those for the first and recurrent stroke events were around 88% and 81%, respectively.

Citations

Citations to this article as recorded by  
  • Incidence and case fatality rates of stroke in Korea, 2011-2020
    Jenny Moon, Yeeun Seo, Hyeok-Hee Lee, Hokyou Lee, Fumie Kaneko, Sojung Shin, Eunji Kim, Kyu Sun Yum, Young Dae Kim, Jang-Hyun Baek, Hyeon Chang Kim
    Epidemiology and Health.2023; : e2024003.     CrossRef
Incidence and case fatality of acute myocardial infarction in Korea, 2011-2020
Yeeun Seo, Jenny Moon, Hyeok-Hee Lee, Hyeon Chang Kim, Fumie Kaneko, Sojung Shin, Eunji Kim, Jang-Whan Bae, Byeong-Keuk Kim, Seung Jun Lee, Min Kim, Hokyou Lee
Epidemiol Health. 2024;46:e2024002.   Published online December 26, 2023
DOI: https://doi.org/10.4178/epih.e2024002
  • 6,155 View
  • 129 Download
  • 1 Crossref
AbstractAbstract AbstractSummary PDFSupplementary Material
Abstract
OBJECTIVES
Cardiovascular diseases are a leading cause of mortality worldwide, and acute myocardial infarction (AMI) is particularly fatal condition. We evaluated the incidence and case fatality rates of AMI in Korea from 2011 to 2020.
METHODS
We utilized data from the National Health Insurance Services to calculate crude, age-standardized, and age-specific incidence rates, along with 30-day and 1-year case fatality rates, of AMI from 2011 to 2020. Age-standardized incidence rates were determined using direct standardization to the 2005 population.
RESULTS
The crude incidence rate of AMI per 100,000 person-years consistently increased from 44.7 in 2011 to 68.3 in 2019, before decreasing slightly to 66.2 in 2020. The age-standardized incidence rate of AMI displayed a 19% rise from 2011 to 2019, followed by a slight decline in 2020. The increasing trend for AMI incidence was more pronounced in males than in females. Both 30-day and 1-year case fatality rates remained stable among younger individuals but showed a decrease among older individuals. There was a minor surge in case fatality in 2020, particularly among recurrent AMI cases.
CONCLUSIONS
Over the past decade, the AMI incidence rate in Korea has consistently increased, with a slight downturn in 2020. The case fatality rate has remained relatively stable except for a minor increase in 2020. This study provides data for continuous surveillance, the implementation of targeted interventions, and the advancement of research aimed at AMI in Korea.
Summary
Key Message
This study observed the incidence rate of acute myocardial infarction using data from Korean National Health Insurance Service. From 2011 to 2019, the incidence rate increased, but there was a slight decrease in 2020. Additionally, the fatality rate remained relatively stable throughout the study period, except for an increase in 2020. The study emphasizes the importance of continuous monitoring and preventive strategies for effective management of acute myocardial infarction.

Citations

Citations to this article as recorded by  
  • Recurrent myocardial infarction as an unsolved problem of evidence-based medicine
    S. Yu. Martsevich
    Cardiovascular Therapy and Prevention.2024; 23(6): 4019.     CrossRef
Incidence and case fatality of stroke in Korea, 2011-2020
Jenny Moon, Yeeun Seo, Hyeok-Hee Lee, Hokyou Lee, Fumie Kaneko, Sojung Shin, Eunji Kim, Kyu Sun Yum, Young Dae Kim, Jang-Hyun Baek, Hyeon Chang Kim
Epidemiol Health. 2024;46:e2024003.   Published online December 26, 2023
DOI: https://doi.org/10.4178/epih.e2024003
  • 6,713 View
  • 146 Download
  • 1 Web of Science
AbstractAbstract AbstractSummary PDFSupplementary Material
Abstract
OBJECTIVES
Stroke remains the second leading cause of death in Korea. This study was designed to estimate the crude, age-adjusted and age-specific incidence rates, as well as the case fatality rate of stroke, in Korea from 2011 to 2020.
METHODS
We utilized data from the National Health Insurance Services from January 1, 2002 to December 31, 2020, to calculate incidence rates and 30-day and 1-year case fatality rates of stroke. Additionally, we determined sex and age-specific incidence rates and computed age-standardized incidence rates by direct standardization to the 2005 population.
RESULTS
The crude incidence rate of stroke hovered around 200 (per 100,000 person-years) from 2011 to 2015, then surged to 218.4 in 2019, before marginally declining to 208.0 in 2020. Conversely, the age-standardized incidence rate consistently decreased by 25% between 2011 and 2020. When stratified by sex, the crude incidence rate increased between 2011 and 2019 for both sexes, followed by a decrease in 2020. Age-standardized incidence rates displayed a downward trend throughout the study period for both sexes. Across all age groups, the 30-day and 1-year case fatality rates of stroke consistently decreased from 2011 to 2019, only to increase in 2020.
CONCLUSIONS
Despite a decrease in the age-standardized incidence rate, the total number of stroke events in Korea continues to rise due to the rapidly aging population. Moreover, 2020 witnessed a decrease in incidence but an increase in case fatality rates.
Summary
Key Message
This nationwide study using Korean National Health Insurance System data reveals a decade-long downward trend in overall stroke incidence rates. While the crude incidence rate showed a temporary increase from 2016 to 2019 before a slight decline in 2020, the age-standardized incidence rate consistently decreased over the study period. The study emphasizes the significance of continuous monitoring and preventive strategies to address stroke as a public health concern in Korea
Systematic Review
Effectiveness of community-based interventions for older adults living alone: a systematic review and meta-analysis
Inhye Kim, Hyunseo An, Sohyeon Yun, Hae Yean Park
Epidemiol Health. 2024;46:e2024013.   Published online January 3, 2024
DOI: https://doi.org/10.4178/epih.e2024013
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AbstractAbstract AbstractSummary PDFSupplementary Material
Abstract
OBJECTIVES
This study examined the effectiveness of community-based interventions designed for older adults living alone through a systematic review and meta-analysis.
METHODS
The study incorporated 4 randomized controlled trials (RCTs) and 5 non-RCTs to evaluate various interventions. The methodological quality of these studies was assessed using the Downs and Black checklist, while Q-statistic and I-square tests were performed to examine statistical heterogeneity. Additionally, visual inspection of funnel plots and the trim-and-fill method were employed to investigate potential publication bias. Of the 2,729 identified studies, 9 met the criteria for inclusion in this review. Independent variables were categorized into 5 groups (physical activity, nutrition, social relationships, social participation, and combined intervention) to examine their effects. Dependent variables were similarly classified into 5 subgroups to identify the specific effects of the interventions.
RESULTS
Interventions focusing on nutrition and combined approaches were the most effective, yielding effect sizes of 0.96 (95% confidence interval [CI], 0.66 to 1.25) and 0.43 (95% CI, 0.26 to 0.60), respectively. The interventions had the greatest impacts on the health behavior and mental health of the participants, with effect sizes of 0.98 (95% CI, 0.73 to 1.22) for health behavior and 0.67 (95% CI, 0.19 to 1.16) for mental health.
CONCLUSIONS
This study suggests a direction for the development of community-based interventions tailored to the needs of older adults living alone. Additionally, it provides evidence to inform policy decisions concerning this demographic.
Summary
Korean summary
본 연구는 독거 노인들 대상으로 한 지역사회 기반 중재의 효과에 대하여 탐색하고 그 효과 크기를 확인하기 위하여 체계적고찰 및 메타분석을 실시하였다. 영양 및 복합 중재가 특히 효과적이었으며, 이는 건강 행동과 정신건강에 있어 중요한 긍정적 효과를 나타내어 추후 개별적 맞춤 중재의 잠재적 효과성을 나타낸다. 이러한 발견은 독거노인 집단의 웰빙 향상을 위한 프로그램과 정책 입안에 근거로 활용될 수 있다.
Key Message
This systematic review and meta-analysis evaluated the impact of community-based interventions for older adults living alone, incorporating 9 studies to assess effectiveness in areas like nutrition and combined strategies. Results indicated significant benefits, particularly in health behavior and mental health, demonstrating the potential of tailored interventions. These findings support the development of targeted programs and policy decisions aimed at improving the well-being of this demographic.
Original Articles
Determinants of unhealthy living by gender, age group, and chronic health conditions across districts in Korea using the 2010-2017 Community Health Surveys
Thi Tra Bui, Thi Huyen Trang Nguyen, Jinhee Lee, Sun Young Kim, Jin-Kyoung Oh
Epidemiol Health. 2024;46:e2024014.   Published online January 4, 2024
DOI: https://doi.org/10.4178/epih.e2024014
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AbstractAbstract AbstractSummary PDFSupplementary Material
Abstract
OBJECTIVES
We investigated the prevalence and determinants of unhealthy living by gender, age, and comorbidities across Korean districts.
METHODS
For 806,246 men and 923,260 women from 245 districts who participated in the 2010-2017 Korean Community Health Surveys, risk scores were calculated based on obesity, physical inactivity, smoking, and high-risk alcohol consumption, each scored from 0 (lowest risk) to 2 (highest risk). A risk score ≥4 was defined as indicating unhealthy living, and weighted proportions were calculated for each district. Using multivariate regression, an ecological model including community socioeconomic, interpersonal, and neighborhood factors was examined by gender, age, and comorbidities.
RESULTS
The mean age-standardized rate of unhealthy living was 24.05% for men and 4.91% for women (coefficients of variation, 13.94% and 29.51%, respectively). Individuals with chronic diseases more frequently exhibited unhealthy lifestyles. Unhealthy lifestyles were associated with educational attainment (β-coefficients: men, -0.21; women, -0.15), high household income (β=0.08 and 0.03, respectively), pub density (β=0.52 and 0.22, respectively), and fast-food outlet density (β=2.81 and 1.63, respectively). Negative associations were observed with manual labor, social activity participation, and hospital bed density. Unhealthy living was positively associated with living alone among women and with being unemployed among middle-aged men. Access to parks was negatively associated with unhealthy living among young men and women. The ecological model explained 32% of regional variation in men and 41% in women.
CONCLUSIONS
Improving the neighborhood built and socioeconomic environment may reduce regional disparities in lifestyle behaviors; however, the impacts may vary according to socio-demographic traits and comorbidities.
Summary
Korean summary
- 시군구 지역단위의 불건강생활(흡연, 음주, 비만, 신체활동 부족 각 0-2점, 합 4점 이상 불건강) 유병률은 여자보다 남자에서 높고, 연령이 높아지면서 감소한다. - 지역사회 환경개선(술집 개수, 패스트푸드점 밀도, 공원 면적, 병상밀도)과 사회경제적 수준 강화(교육수준, 가구소득, 고용)를 통해 생활습관적 건강행태의 지역 격차를 줄일 수 있다. - 이러한 향상 노력의 효과는 지역의 건강상태 수준이나 사회인구학적 특성에 따라 다를 수 있다.
Key Message
• District prevalence rates of unhealthy living were higher among men than women and decreased with advancing age. • Efforts to reduce regional disparities in lifestyle behaviors could benefit from enhancements to the neighborhood environment and the socioeconomic status of the area. • The effectiveness of such improvements may vary based on socio-demographic characteristics and health conditions.
An epidemic of cataract surgery in Korea: the effects of private health insurance on the National Health Insurance Service
Hyejin Lee, Soo-Hee Hwang, Choon-Seon Park, Seol-Hee Chung, Catherine L. Chen, Jin Yong Lee, Jin Soo Lee
Epidemiol Health. 2024;46:e2024015.   Published online January 6, 2024
DOI: https://doi.org/10.4178/epih.e2024015
  • 2,644 View
  • 132 Download
  • 1 Crossref
AbstractAbstract AbstractSummary PDFSupplementary Material
Abstract
OBJECTIVES
In Korea, the National Health Insurance Service (NHIS) covers essential healthcare expenses, including cataract surgery. To address concerns that private health insurance (PHI) might have inflated the need for such procedures, we investigated the extent of the PHI-attributable increase in cataract surgery and its impact on NHIS-reimbursed expenses.
METHODS
This retrospective, observational study uses nationwide claims data for cataract surgery from 2016 to 2020. We examined trends in utilization and cost, and we estimated the excess numbers of (1) cataract operations attributable to PHI and (2) types of intraocular lenses used for cataract surgery in 2020.
RESULTS
Between 2016 and 2020, a 36.8% increase occurred in the number of cataract operations, with increases of 63.5% and 731.8% in the total healthcare costs reimbursed by NHIS and PHI, respectively. Over a 5-year period, the surgical rate per 100,000 people doubled for patients aged <65 years (from 328 in 2016 to 664 in 2020). Among the 619,771 cases in 2020 of cataract surgery reimbursed by the Korean diagnosis-related group system, more non-NHIS-covered intraocular lenses were used for patients aged <65 years than ≥65 years (68.1 vs. 14.2%). In 2020 alone, an estimated 129,311 excess operations occurred, accounting for an excess cost of US$115 million.
CONCLUSIONS
A dramatic increase in the number and cost of cataract operations has occurred over the last 5 years. The PHI-related increase in operations resulted in increased costs to NHIS. Measures to curtail the non-indicated use of cataract surgery should be implemented regarding PHI.
Summary
Korean summary
백내장 수술에서 실손보험으로 인한 의료비 증가 수준을 확인하고 건강보험급여 비용에 미치는 영향을 조사했을 때 2016년과 2020년 사이에 백내장 수술 건수는 36.8% 증가했으며, 건강보험과 실손보험에서 지급한 총 의료 비용은 각각 63.5%와 731.8% 증가했다. 백내장 수술은 65세 미만에서 주로 증가하였으며, 이 연령층은 공단에서 급여하지 않는 고가의 인공수정체를 더 많이 사용하였다. 추정 초과 수술 건수는 2020년에만 129,311건으로 1억 1,500만 달러의 초과 비용이 발생했다.

Citations

Citations to this article as recorded by  
  • Global prevalence of cataract surgery
    Hassan Hashemi, Faezeh Fayaz, Alireza Hashemi, Mehdi Khabazkhoob
    Current Opinion in Ophthalmology.2024;[Epub]     CrossRef
COVID-19: Original Article
The bounds of meta-analytics and an alternative method
Ramalingam Shanmugam, Mohammad Tabatabai, Derek Wilus, Karan P. Singh
Epidemiol Health. 2024;46:e2024016.   Published online January 7, 2024
DOI: https://doi.org/10.4178/epih.e2024016
  • 2,979 View
  • 75 Download
AbstractAbstract AbstractSummary PDFSupplementary Material
Abstract
OBJECTIVES
Meta-analysis is a statistical appraisal of the data analytic implications of published articles (Y), estimating parameters including the odds ratio and relative risk. This information is helpful for evaluating the significance of the findings. The Higgins I2 index is often used to measure heterogeneity among studies. The objectives of this article are to amend the Higgins I2 index score in a novel and innovative way and to make it more useful in practice.
METHODS
Heterogeneity among study populations can be affected by many sources, including the sample size and study design. They influence the Cochran Q score and, thus, the Higgins I2 score. In this regard, the I2 score is not an absolute indicator of heterogeneity. Q changes by bound as Y increases unboundedly. An innovative methodology is devised to show the conditional and unconditional probability structures.
RESULTS
Various properties are derived, including showing that a zero correlation between Q and Y does not necessarily mean that they are independent. A new alternative statistic, S2, is derived and applied to mild cognitive impairment and coronavirus disease 2019 vaccination for meta-analysis.
CONCLUSIONS
A hidden shortcoming of the Higgins I2 index is overcome in this article by amending the Higgins I2 score. The usefulness of the proposed methodology is illustrated using 2 examples. The findings have potential health policy implications.
Summary
Key Message
An approach to overcome the hidden shortcomings of Higgens I2 in meta-analysis. The approach has potential health policy implications.
Original Article
A prospective association between dietary mushroom intake and the risk of type 2 diabetes: the Korean Genome and Epidemiology Study–Cardiovascular Disease Association Study
Yu-Mi Kim, Hye Won Woo, Min-Ho Shin, Sang Baek Koh, Hyeon Chang Kim, Mi Kyung Kim
Epidemiol Health. 2024;46:e2024017.   Published online January 8, 2024
DOI: https://doi.org/10.4178/epih.e2024017
  • 3,727 View
  • 109 Download
AbstractAbstract AbstractSummary PDFSupplementary Material
Abstract
OBJECTIVES
Mushrooms, known for their nutritious and functional components, are considered healthy and medicinal. This study investigated the prospective association between dietary mushroom consumption and the incidence of type 2 diabetes among Korean adults aged ≥40 years.
METHODS
In total, 16,666 participants who were not taking anti-diabetic medication or insulin and had normal fasting blood glucose (FBG; <126 mg/dL) were included. We used the cumulative average dietary consumption of mushrooms as an exposure metric, calculated from food frequency questionnaires at every follow-up, along with covariates collected during a baseline survey. To estimate incidence rate ratios (IRRs) for type 2 diabetes, a modified Poisson regression model with a robust error estimator was applied.
RESULTS
In multivariable models, dietary mushroom consumption was inversely associated with type 2 diabetes incidence in both genders (men: IRR, 0.65; 95% confidence interval [CI], 0.47 to 0.90; p<sub>linearity</sub>=0.043 in the highest quartile (Q4) vs. the lowest quartile (Q1); women: IRR, 0.70; 95% CI, 0.54 to 0.93; p<sub>linearity</sub>=0.114 in Q4 vs. Q1). The inverse association remained after adjustment for dietary factors instead of dietary quality index, the baseline FBG, and the exclusion of incidence within the first year. Additionally, no significant interaction was found regarding the risk of type 2 diabetes between dietary mushroom consumption and participants’ gender or other factors.
CONCLUSIONS
Dietary mushroom consumption was inversely linked with the risk of type 2 diabetes incidence in both genders, indicating the beneficial role of mushrooms in preventing the disease.
Summary
Korean summary
- 흔히 사용하는 버섯의 식이 섭취량이 증가함에 따라 한국 40세 이상 성인에서 제2형 당뇨병 발생 위험이 낮았다. - 이러한 역관계는 성별과 다양한 식이 배경에서도 일관성을 유지하였고, 이는 버섯이 제2형 당뇨병 예방에 있어 잠재적인 식이요소로서의 가능성을 보여주는성을 보여주는 보여주는 결과이다.
Key Message
• Increased dietary consumption of commonly used mushrooms is associated with a lower risk of type 2 diabetes incidence among adults aged 40 years or older in Korea. • This inverse relationship remains consistent across genders and various dietary backgrounds, underscoring the potential of mushrooms as a preventive dietary component against.

Epidemiol Health : Epidemiology and Health
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