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Original articles
Socioeconomic inequality in organized and opportunistic screening for breast cancer: results from the Korean National Cancer Screening Survey, 2009-2021
Yejin Ha, Xuan Quy Luu, Woorim Kim, Jae Kwan Jun, Mina Suh, Kui Son Choi
Epidemiol Health. 2025;e2025031.   Published online May 30, 2025
DOI: https://doi.org/10.4178/epih.e2025031    [Accepted]
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Abstract
OBJECTIVES
Breast cancer screening rates have increased since the introduction of the National Cancer Screening Program (NCSP) in Korea. However, it remains unclear whether socioeconomic inequalities have improved, particularly according to screening type. This study investigated inequalities in organized (government-led) and opportunistic (individually initiated) screening, stratified by education and income levels.
METHODS
Data were obtained from the Korean National Cancer Screening Survey, conducted annually from 2009 to 2021, involving approximately 1,700 women each year except in 2009. Trends were analyzed using joinpoint regression to calculate average annual percent changes (AAPCs). Socioeconomic inequalities were assessed using the slope index of inequality (SII) and relative index of inequality (RII).
RESULTS
Organized screening rates increased from 42.0% in 2009 to 60.2% in 2021 (AAPC, 1.9; 95% confidence interval [CI], 0.7-3.4), whereas opportunistic screening rates declined from 13.3% to 11.2% (AAPC, -5.4; 95% CI, -8.7 to -2.3). For organized screening, individuals with lower education levels exhibited higher participation, resulting in negative inequality indices (SII, -5.37%; RII, 0.80). No significant income-based inequality was found (SII, 1.60; RII, 1.07). However, opportunistic screening demonstrated significant inequalities by both education (SII, 5.37%; RII, 1.92) and income (SII, 5.90%; RII, 1.96), with higher participation rates among more advantaged groups.
CONCLUSIONS
The NCSP has improved breast cancer screening rates and reduced income-related inequality in organized screening. However, educational and income-based inequalities persist in opportunistic screening. To reduce screening inequities, policy efforts are needed to further promote the NCSP, including improving program quality and providing financial support for follow-up examinations.
Summary
Spatial patterns of laboratory-confirmed leptospirosis in northeastern Peninsular Malaysia, 2016–2023
Hazlienor Mohd Hatta, Kamarul Imran Musa, Nik Mohd Hafiz Mohd Fuzi, Paula Moraga
Epidemiol Health. 2025;e2025030.   Published online May 29, 2025
DOI: https://doi.org/10.4178/epih.e2025030    [Accepted]
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Abstract
OBJECTIVES
Leptospirosis presents significant public health challenges in endemic regions such as north-eastern Peninsular Malaysia. Spatial analysis is essential for visualising disease incidence and distribution, assessing vulnerability based on geographical and socio-economic factors, and ultimately informing targeted interventions, optimising resource allocation, and enhancing surveillance strategies. This study aimed to determine the incidence and characterise the spatial distribution of leptospirosis in Kelantan, Malaysia.
METHODS
All laboratory-confirmed leptospirosis cases reported in Kelantan between 2016 and 2023 were extracted from the Communicable Disease Control Information System (CDCIS) e-Notifikasi online database. Spatial analyses were performed using the spatstat, spdep, and ggplot2 packages within the RStudio integrated development environment.
RESULTS
The analysis encompassed 1534 laboratory-confirmed leptospirosis cases. The average crude annual incidence of leptospirosis cases per 1000 population from 2016 to 2023 was 0.101 (95% CI: 0.038, 0.164). Incidence varied considerably across districts and subdistricts, initially higher in the north but declining over time, while consistently high and increasing incidence was observed in the southern region. Significant clustering of leptospirosis cases occurred throughout the studied years, except during the COVID-19 pandemic. Hotspots were initially prevalent in northern areas but later emerged in south-eastern and southern regions. Significant spatial autocorrelation evolved from high-low to high-high clusters, particularly evident in central and southern regions.
CONCLUSIONS
This study provides valuable local epidemiological and spatial insights into the endemicity of leptospirosis. The findings highlight the need for targeted interventions and continued surveillance to effectively mitigate the leptospirosis burden in endemic areas.
Summary
Safety of combination therapy of azilsartan medoxomil and amlodipine: a population-based cohort study
Hyesung Lee, Bin Hong, Chris Tzu-Ting Su, Sungho Bea, Han Eol Jeong, Kyungyeon Jung, Michael Chun-Yuan Cheng, Zoe Chi-Jui Chang, Edward Chia-Cheng Lai, Jongyoung Lee
Epidemiol Health. 2025;e2025029.   Published online May 28, 2025
DOI: https://doi.org/10.4178/epih.e2025029    [Accepted]
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AbstractAbstract PDF
Abstract
OBJECTIVES
This study investigated the safety of azilsartan and amlodipine combination therapy versus other angiotensin receptor blockers (ARBs) and amlodipine in patients with hypertension.
METHODS
We conducted a cohort study utilizing healthcare databases from South Korea and Taiwan. Patients aged between 18 and 75 years who were newly prescribed both an ARB and amlodipine within 6 months of hypertension diagnosis were included. Safety outcomes assessed were hypotension, angioedema, acute pancreatitis, hyperkalemia, hypokalemia, toxic liver disease, hepatic failure, nausea and vomiting, and fall-related injury. Hazard ratios (HRs) with 95% confidence intervals (CIs) for each safety outcome associated with azilsartan medoxomil and amlodipine versus other ARBs combined with amlodipine were calculated within a 1:1 propensity score (PS)-matched cohort. Summary HRs across databases were computed using random-effects meta-analysis.
RESULTS
We identified 2,472 eligible patients (1,521 from Korea, 951 from Taiwan) initiating treatment with azilsartan medoxomil and amlodipine, and 671,468 patients (312,322 from Korea, 355,409 from Taiwan) initiating other ARBs with amlodipine. After PS matching, baseline characteristics were well-balanced between treatment groups. During the 180-day follow-up, most adverse outcomes did not occur even once in either group, thus precluding the calculation of HRs. The risk of acute pancreatitis was not significantly different between the azilsartan medoxomil and amlodipine group and the other ARB and amlodipine groups (summary HR, 0.86 [95% CI, 0.14–5.37]).
CONCLUSIONS
In this population-based cohort study, azilsartan medoxomil combined with amlodipine was not associated with an increased risk of adverse outcomes compared to other ARBs combined with amlodipine.
Summary
Mortality burden attributable to long-term exposure to fine particulate matter among older adults in South Korea
Jongmin Oh, Jisun Myung, Changwoo Han, Hyun Joo Bae, Soontae Kim, Yun-Chul Hong, Dong-Wook Lee, Youn-Hee Lim
Epidemiol Health. 2025;e2025028.   Published online May 28, 2025
DOI: https://doi.org/10.4178/epih.e2025028    [Accepted]
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Abstract
OBJECTIVES
This study aimed to evaluate the association between long-term exposure to fine particulate matter (PM2.5) and cause-specific mortality among older adults in South Korea, providing insights into the evolving public health burden in an aging society.
METHODS
We analyzed national insurance claims data from the Republic of Korea spanning 2010–2019. Modeled PM2.5 concentrations were assigned to participants according to their residential districts. We employed time-varying Cox proportional hazard models, using age as the time scale, adjusted for potential confounders. Six cause-specific mortalities were considered: ischemic heart disease (IHD), stroke, chronic obstructive pulmonary disease (COPD), acute lower respiratory infection (ALRI), lung cancer (LC), and type 2 diabetes mellitus (T2DM). Annual excess deaths attributable to long-term PM2.5 exposure were calculated.
RESULTS
A total of 5,360,032 older adults were followed from 2010 to 2019. Hazard ratios (HRs) per 10 μg/m³ increase in 12-month PM2.5 concentration were as follows: IHD, 1.068 (95% CI, 1.040–1.097); stroke, 1.023 (95% CI, 1.003–1.043); ALRI, 1.050 (95% CI, 1.026–1.076); COPD, 1.114 (95% CI, 1.072–1.157); T2DM, 1.046 (95% CI, 1.007–1.086); and LC, 0.972 (95% CI, 0.948–0.996). Excess deaths attributable to long-term PM2.5 exposure were estimated at 4,888 (95% CI, 2,304–7,323) in 2010 and 5,179 (95% CI, 2,585–7,648) in 2019.
CONCLUSIONS
Although PM2.5 levels in South Korea have shown a declining trend over the past decade, mortality among older adults associated with long-term PM2.5 exposure has not significantly decreased, likely due to the rapid aging of the population.
Summary
Special article
The Korean National Codes Against Cancer: background of their establishment and the revision process
Yoonjoo Choi, Jin-Kyoung Oh, Ayoung Byeon, Byungmi Kim
Epidemiol Health. 2025;e2025027.   Published online May 14, 2025
DOI: https://doi.org/10.4178/epih.e2025027    [Accepted]
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AbstractAbstract PDF
Abstract
OBJECTIVES
The Korean National Codes Against Cancer provide guidelines for cancer prevention. The inaugural edition was published in 2006, followed by a major revision in 2016. This study aimed to describe the historical context, scientific rationale, and revision process of these guidelines.
METHODS
With rising cancer incidence in the early 2000s, the Korean government recognized the need for national cancer prevention guidelines, prompting the National Cancer Center to initiate their formulation. The Division of Cancer Prevention reviewed global literature on cancer trends and Korea-specific studies on cancer risk factors. The final set of 10 recommendations comprising the Korean National Codes Against Cancer was approved by the National Cancer Control Committee after achieving expert consensus on cancer prevention.
RESULTS
The finalized guidelines are firmly grounded in scientific evidence. The 10 current recommendations include: (1) no smoking and avoidance of secondhand smoke; (2) consuming sufficient fruits and vegetables as part of a balanced diet; (3) reducing salt intake and avoiding burnt or charred foods; (4) limiting alcohol consumption; (5) engaging in regular physical activity (at least 30 minutes a day, 5 days a week); (6) maintaining a healthy body weight; (7) receiving immunization against hepatitis B virus and human papillomavirus; (8) practicing safe sex by maintaining a single sexual partner and using condoms; (9) following health and safety guidelines to avoid exposure to occupational carcinogens; and (10) undergoing regular cancer screening.
CONCLUSIONS
This study detailed the sources and procedures involved in formulating and revising the Korean National Codes Against Cancer.
Summary
Original articles
Adherence to the Korean National Code Against Cancer and mortality: a prospective cohort study from the Health Examinees-Gem study
Jeeyoo Lee, Aesun Shin, Woo-Kyoung Shin, Ji-Yeob Choi, Daehee Kang
Epidemiol Health. 2025;e2025026.   Published online May 9, 2025
DOI: https://doi.org/10.4178/epih.e2025026    [Accepted]
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AbstractAbstract PDF
Abstract
OBJECTIVES
The Korean National Code Against Cancer was released in 2006. These guidelines aimed to promote a healthy lifestyle to prevent cancer risk through 10 recommendations. The objective of this study was to investigate the associations between adherence to the Korean National Code Against Cancer and the risk of all-cause, cancer, and cardiovascular disease (CVD) mortality among Koreans.
METHODS
This prospective cohort study included 109,160 Korean adults aged 40 to 69 years, recruited from 2004 to 2013 in the population-based Health Examinees-Gem Study (HEXA-G). The adherence total score was calculated based on 6 items from the Korean National Code Against Cancer: smoking, consuming vegetables and fruits, limiting salty foods, restricting alcohol intake, engaging in physical activity, and maintaining a healthy weight. Hazard ratios (HRs) and 95% confidence intervals (CIs) for the associations of adherence scores with mortality risk were estimated using a Cox proportional hazards regression model.
RESULTS
During a mean follow-up period of 12.0 years, 3,799 deaths were recorded. According to the multivariable-adjusted model, men in the highest tertile of adherence scores had a lower risk of all-cause, cancer, and CVD mortality compared to those in the lowest tertile (all-cause: HR=0.67, 95% CI=0.60–0.74; cancer: HR=0.63, 95% CI=0.54–0.74; CVD: HR=0.56, 95% CI=0.43–0.73). A similar association was observed among women for all-cause and CVD mortality (all-cause: HR=0.85, 95% CI=0.76–0.96; CVD: HR=0.70, 95% CI=0.51–0.97).
CONCLUSIONS
Adherence to the Korean National Code Against Cancer was associated with a reduced risk of all-cause, cancer, and CVD mortality.
Summary
Social capital and regional influences: key predictors of unmet dental care needs among older adults in South Korea
Ji-Yeon Lim, Ju-Mi Lee, Hae-Sung Nam
Epidemiol Health. 2025;e2025025.   Published online May 7, 2025
DOI: https://doi.org/10.4178/epih.e2025025    [Accepted]
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AbstractAbstract PDF
Abstract
OBJECTIVES
Access to dental services is essential for improving quality of life, and social capital plays a key role in facilitating that access. This study aimed to identify individual- and regional-level factors, including social capital, that predict unmet dental care needs among older adults.
METHODS
We analyzed data from 59,414 older adults obtained from the 2023 Korea Community Health Survey and the Korean Statistical Information Service, employing a 2-level multilevel model. The dependent variables comprised 3 types of unmet dental care needs: overall, due to lack of acceptability, and due to economic reasons. Twelve independent variables, including social capital and other individual and regional factors, were examined.
RESULTS
The prevalence of unmet needs was 14.15% overall, 8.70% for acceptability reasons, and 4.85% for economic reasons. Lower individual social capital was associated with higher odds of unmet dental care needs, whereas regional social capital factors demonstrated no significant association. Residing in regions with higher fiscal independence ratios was related to an increased likelihood of economic unmet needs (odds ratio [OR], 1.29; 95% confidence interval [CI], 1.09 to 1.52). In contrast, a greater density of dentists per 10,000 population was inversely associated with overall and acceptability-related unmet needs (OR, 0.82 for both; 95% CI, 0.73 to 0.92 and 0.73 to 0.93, respectively).
CONCLUSIONS
Individual social capital and specific regional factors—namely, fiscal independence and density of dentists—may represent important determinants of unmet dental care needs among older adults. Policy interventions aimed at reducing unmet needs should consider these variables.
Summary
Risk of new-onset seizures following immunization against COVID-19: a self-controlled case-series study
Hwa Yeon Ko, Dongwon Yoon, Ju Hwan Kim, Han Eol Jeong, Seung Bong Hong, Won Chul Shin, JU YOUNG SHIN
Epidemiol Health. 2025;e2025024.   Published online May 2, 2025
DOI: https://doi.org/10.4178/epih.e2025024    [Accepted]
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Abstract
OBJECTIVES
Despite emerging reports of new-onset seizures (NOS) following COVID-19 vaccination, safety evidence regarding the risk of NOS after vaccination remains limited. We aimed to investigate the potential association between NOS and COVID-19 vaccination.
METHODS
We conducted a self-controlled case series study utilizing a nationwide database linking the COVID-19 vaccination registry and the National Health Information Database (from February 2021 to October 2022). We identified adults (≥18 years) who received COVID-19 vaccination (BNT162b2, ChAdOx1 nCoV-19, mRNA-1273, NVX-CoV2373, or Ad26.COV2.S) and had a diagnosis of NOS accompanied by prescriptions of anti-seizure drugs. The observation period was defined as 240 days following vaccination. We evaluated the risk of NOS during a risk window of 28 days after vaccination compared to the control window (the remaining observation period excluding the risk window). Incidence rate ratios (IRRs) with 95% confidence intervals (CIs) were estimated using a conditional Poisson regression model.
RESULTS
Among 42,155,198 COVID-19 vaccine recipients, we identified 1,849 and 4,217 patients with NOS in the risk and control windows, respectively. There was no increased risk of NOS within the 28-day period following vaccination (IRR, 0.99; 95% CI, 0.94–1.05). Although results from subgroup analyses by vaccine type were largely consistent with the main findings (IRR, 0.95; 95% CI, 0.88–1.03 for BNT162b2; IRR, 0.95; 95% CI, 0.77–1.16 for ChAdOx1 nCoV-19; IRR, 1.58; 95% CI, 0.52–4.83 for Ad26.COV2.S), a marginally elevated risk was observed for mRNA-1273 (IRR, 1.21; 95% CI, 1.04–1.42).
CONCLUSIONS
There was no evidence of an increased risk of NOS following COVID-19 vaccination. These findings can be used as safety evidence in clinical decision-making and to bolster public confidence in COVID-19 vaccines. 
Summary
Association between humidifier disinfectant use duration and lung cancer development in the Republic of Korea
Sungchan Kang, Jeong-In Hwang, Su Hwan Kim, Hyungryul Lim, Dong-wook Lee, Woojoo Lee, Jong Hun Kim, Sol Yu, Jungyun Lim, Younghee Kim, Kyoung-Nam Kim
Epidemiol Health. 2025;e2025023.   Published online May 2, 2025
DOI: https://doi.org/10.4178/epih.e2025023    [Accepted]
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AbstractAbstract PDF
Abstract
OBJECTIVES
This study was conducted to assess the association between the duration of humidifier disinfectant use and lung cancer development.
METHODS
We analyzed data from 3,605 applicants registered for compensation from the Korean government due to health conditions related to humidifier disinfectant exposure. Among these individuals, 121 were diagnosed with lung cancer at least 4 years after their initial exposure (through December 2021). Hazard ratios (HRs) and 95% confidence intervals (CIs) for lung cancer incidence were estimated according to the duration of disinfectant use using Cox proportional hazards models.
RESULTS
Compared with <5 months of use, the HRs for lung cancer were 1.81 (95% CI, 0.41 to 7.97) for 5–14 months, 2.45 (95% CI, 0.58 to 10.41) for 15–29 months, and 4.61 (95% CI, 1.12 to 18.91) for ≥30 months. Using never smokers with <15 months of use as the reference category, the HRs were 2.97 (95% CI, 1.34 to 6.56) for never smokers with ≥15 months of use, 2.73 (95% CI, 0.94 to 7.95) for current or former smokers with <15 months of use, and 4.74 (95% CI, 1.94 to 11.61) for current or former smokers with 15 months of use.
CONCLUSIONS
Our study provides some of the first robust epidemiological evidence that prolonged humidifier disinfectant use contributes to lung cancer development. Future studies—particularly those including unexposed populations—are needed to confirm these findings.
Summary
Inequality in mortality according to regional deprivation during the COVID-19 pandemic
Min Hui Moon, Min-Hyeok Choi, Young Gyu Ko
Epidemiol Health. 2025;e2025022.   Published online April 29, 2025
DOI: https://doi.org/10.4178/epih.e2025022    [Accepted]
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AbstractAbstract PDF
Abstract
OBJECTIVES
Vulnerability to coronavirus disease 2019 (COVID-19) is significantly greater in regions with lower socioeconomic status. However, detailed analyses of regional socioeconomic disparities have rarely been conducted in South Korea. This study aimed to identify and compare mortality inequalities associated with regional socioeconomic status across different areas of South Korea during the COVID-19 pandemic.
METHODS
Using cause-of-death statistics from 2020 to 2022, we calculated age-standardized mortality rates (ASMRs) for total mortality, COVID-19 mortality, and pneumonia mortality. The socioeconomic status of each region was assessed using the regional deprivation index. Additionally, we calculated the rate difference (RD), rate ratio (RR), slope index of inequality (SII), and relative index of inequality (RII) for each socioeconomic level to examine the extent of mortality inequality and its temporal changes. These analyses were stratified by sex and urban-rural classification.
RESULTS
The total mortality rate, as well as COVID-19-specific and pneumonia-specific mortality rates, increased during the COVID-19 pandemic. The ASMR for COVID-19 was higher in rural areas (ASMR, 27.79), which have lower healthcare accessibility, compared to urban areas (ASMR, 26.63). However, mortality inequality indicators for COVID-19 were more pronounced in urban areas compared to rural areas (SII [urban: 2.72; rural: -0.05], RII [urban: 0.10; rural: 0.00]). Notably, significant inequalities were observed among men residing in urban areas.
CONCLUSIONS
In disaster situations such as the COVID-19 pandemic, it is essential to implement strategies aimed at reducing overall mortality rates and addressing regional socioeconomic inequalities.
Summary
Geospatial analysis of neonatal mortality in North-eastern India: a multilevel Bayesian approach
Vidhi Jain, Kh. Jitenkumar Singh, Deboshree Das, Shefali Gupta, Gunjan Singh
Epidemiol Health. 2025;e2025021.   Published online April 27, 2025
DOI: https://doi.org/10.4178/epih.e2025021    [Accepted]
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AbstractAbstract PDF
Abstract
OBJECTIVES
Neonatal mortality remains a significant public health issue in India. This study investigates spatial patterns and contributing factors to neonatal mortality in the north-eastern states, identifying hotspot regions and spatial variations.
METHODS
A sample of 34,222 mothers from NFHS-5 (2019–21) in the north-eastern states was analysed. Descriptive and bivariate analyses were conducted alongside Bayesian multilevel logistic regression using Integrated Nested Laplace Approximation (INLA) to model neonatal mortality. Spatial hotspot analysis using Getis-Ord Gi* statistics identified clusters of high neonatal mortality, while geographically weighted regression (GWR) was used to examine spatial variations in the relationships between neonatal mortality and contributing factors.
RESULTS
The neonatal mortality rate in the north-eastern states declined from 45 to 21 per 1,000 live births (NFHS-1 to NFHS-5) but remains higher than the national average. Assam reported the highest mortality (42.16%), whereas Sikkim had the lowest (0.87%). Higher mortality was observed among male infants, mothers with advanced age, low maternal education, and mothers who attended less than 5 antenatal care (ANC) visits. Spatial analysis identified hotspots in Assam, Meghalaya, and Tripura. GWR indicated that areas with less than 5 ANC visits had the strongest association with neonatal mortality. Bayesian multilevel analysis highlighted spatial variations of up to 51% across districts in northeast India.
CONCLUSIONS
This study underscores spatial disparities in neonatal mortality across north-eastern India. Addressing childcare practices and healthcare access in hotspot regions is essential for improving new-born health outcomes. The findings provide critical insights for policymakers to develop targeted interventions aimed at reducing neonatal mortality in these underserved areas.
Summary
Systematic review
Guts of healthy humans, livestock, and pets harbor critical-priority and high-risk Escherichia coli clones
Idris Nasir Abdullahi, Islem Trabelsi
Epidemiol Health. 2025;e2025013.   Published online March 22, 2025
DOI: https://doi.org/10.4178/epih.e2025013    [Accepted]
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AbstractAbstract PDF
Abstract
OBJECTIVES
In May 2024, the World Health Organization classified carbapenem (CARB)- and third-generation cephalosporin (3GC) resistance (R) in Escherichia coli as a critical priority, whereas colistin (COL) is a "last resort" antibiotic for their treatment. This meta-analysis evaluated the pooled prevalence, high-risk lineages, genetic relatedness, and mechanisms of CARBR, COLR, and 3GCR in Escherichia coli from healthy humans and animals.
METHODS
We conducted a systematic review and meta-analyses following the PRISMA criteria on all eligible studies that reported the analysis of E. coli, and antimicrobial susceptibility to CARB, COL and 3GC in E. coli from gut samples of clinically healthy humans, livestock, and pets from June 2014 to June 2024. Random-effect models and CSI Phylogeny 1.4 were used to determine pooled prevalence rates (PPs) and the relatedness of publicly available E. coli genomes, respectively.
RESULTS
Of the 5034 identified articles, 55 studies were deemed eligible. The overall PPs of 3GCR, CARBR- and COLR E. coli were 19% (95% CI, 14.5%-24.4%), 1.6% (95% CI, 0.8%-3.5%), and 13.3% (95% CI, 8.4%-20.9%), respectively. The PPs of 3GCR-, COLR- and CARBR E. coli significantly varied by hosts, continent, and year of studies (p<0.05). Diverse E. coli lineages were found, including 13 high-risk E. coli sequence types (STs), within which ST10 predominated. Phylogenomic analyses produced 4 clusters of related CARBR- and COLR E. coli strains (< 25 SNP): ST940-blaOXA-181 from humans in Lebanon, ST617-mcr-1 from pigs in China, ST46-mcr-1 from poultry in Tanzania, and ST1720-mcr-1 from goats in France.
CONCLUSIONS
COLR and 3GCR are more frequent than CARBR in gut E. coli. These 10-year epidemiological data highlight the persistence and transmission of critical priority and high-risk E. coli strains in healthy humans and animals, raising significant One Health concerns.
Summary
Original articles
Preventable cancer cases and deaths attributable to deficit of physical activity in Korea from 2015 to 2030
Soseul Sung, Sungji Moon, Jihye An, Jeehi Jung, Hyeon Sook Lee, Youjin Hong, Sangjun Lee, Woojin Lim, Kyungsik Kim, Inah Kim, Jung Eun Lee, Sun Ha Jee, Aesun Shin, Ji-Yeob Choi, Sun-Seog Kweon, Min-Ho Shin, Sangmin Park, Seung-Ho Ryu, Sun Young Yang, Seung Ho Choi, Jeongseon Kim, Sang-Wook Yi, Yoon-Jung Choi, Jeong-Soo Im, Hong Gwan Seo, Sohee Park, Kwang-Pil Ko, Sue K. Park
Epidemiol Health. 2025;e2025010.   Published online February 27, 2025
DOI: https://doi.org/10.4178/epih.e2025010    [Accepted]
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AbstractAbstract PDF
Abstract
OBJECTIVES
This study aimed to determine the population–attributable fractions (PAFs) of cancers using various calculation methods and to estimate the PAFs of cancer incidence and mortality resulting from deficit in physical activity (DPA) from 2015 to 2030, based on data on prevalence rates.
METHODS
The PAF of cancer was estimated using a cohort study–based meta–analysis of relative risk (RR), national prevalence rates of DPA from 2000 to 2015, and national cancer statistics from 2015 to 2030, with a latency of 15 years.
RESULTS
In 2015, DPA contributed to 909 cancer cases and 548 deaths, accounting for 0.42% and 0.68% of new cancer cases and deaths, respectively. By 2030, the PAF values are expected to increase to 1.31% of incidence and 1.80% of mortality, with a continual increase from 2015 to 2030. When the low metabolic equivalent of task (MET) criteria were selected, the PAF values decreased for both incidence and mortality. The PAF calculated with <900 MET–min/week for the sex–specific MET criterion was higher than that calculated with <900 MET–min/week for both incidence and mortality.
CONCLUSIONS
The risk of cancer associated with DPA is expected to rise in both men and women. Future research and strategies should emphasize the promotion of physical activity for cancer prevention, considering its significant implications for public health.
Summary
Preventable cancer cases and deaths attributable to alcohol consumption in Korea from 2015 to 2030
Soseul Sung, Jihye An, Jeehi Jung, Hyeon Sook Lee, Sungji Moon, Inah Kim, Jung Eun Lee, Aesun Shin, Sun Ha Jee, Sun-Seog Kweon, Min-Ho Shin, Sangmin Park, Seung-Ho Ryu, Sun Young Yang, Seung Ho Choi, Jeongseon Kim, Sang-Wook Yi, Yoon-Jung Choi, Youjin Hong, Sangjun Lee, Woojin Lim, Kyungsik Kim, Sohee Park, Jeong-Soo Im, Hong Gwan Seo, Kwang-Pil Ko, Sue K. Park
Epidemiol Health. 2025;e2025009.   Published online February 27, 2025
DOI: https://doi.org/10.4178/epih.e2025009    [Accepted]
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AbstractAbstract PDF
Abstract
OBJECTIVES
Alcohol consumption is causally linked to several cancers, and major health organizations classify it as a carcinogen. This study assessed the impact of alcohol consumption on cancer incidence and mortality in Korea in 2015 and 2020, projected trends up to 2030, and compared results based on different criteria.
METHODS
The relative risk of cancer associated with alcohol consumption in Korea was determined through a meta–analysis of alcohol–related relative risks for specific cancers, using primary data from the Korean Cohort Study within the Korean Cohort Consortium. The population–attributable fraction (PAF) was calculated using Levin's formula, incorporating drinking prevalence and the number of cancer cases and deaths, with a 15–year latency period assumed.
RESULTS
In Korea, the PAF for alcohol consumption, based on ever/never drinking criteria, was higher than that calculated using other criteria, except for the PAF based on past and current/never drinking criteria. Alcohol consumption contributed to 3.58% of all cancer cases and 3.28% of cancer deaths in 2015. It accounted for 4.58% of new cancer cases in men and 2.08% in women, with a higher contribution to incidence than mortality (4.00% and 2.25% of cancer deaths in men and women, respectively). Projections indicate that alcohol–related cancer PAF will decrease by 17.2% in men but increase by 70.2% in women by 2030.
CONCLUSIONS
This study highlights the impact of alcohol consumption on cancer in Korea, emphasizing the need for sex–specific regulations to address sex differences.
Summary
Preventable cancer cases and deaths attributable to tobacco smoking in Korea from 2015 to 2030
Soseul Sung, Jihye An, Jeehi Jung, Hyeon Sook Lee, Sungji Moon, Inah Kim, Jung Eun Lee, Aesun Shin, Sun Ha Jee, Sun-Seog Kweon, Min-Ho Shin, Sangmin Park, Seung-Ho Ryu, Sun Young Yang, Seung Ho Choi, Jeongseon Kim, Sang-Wook Yi, Yoon-Jung Choi, Youjin Hong, Sangjun Lee, Woojin Lim, Kyungsik Kim, Daehee Kang, Keun-Young Yoo, Sohee Park, Jeong-Soo Im, Hong Gwan Seo, Hai-Rim Shin, Kwang-Pil Ko, Sue K. Park
Epidemiol Health. 2025;e2025008.   Published online February 27, 2025
DOI: https://doi.org/10.4178/epih.e2025008    [Accepted]
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AbstractAbstract PDF
Abstract
OBJECTIVES
Tobacco smoking is a major public health concern worldwide. This study aimed to assess its impact on cancer incidence and mortality by estimating the population attributable fraction (PAF) in the Korean population for 2015 and 2020 and by projecting future trends until 2030.
METHODS
The Korean relative risk (RR) was calculated via a meta–analysis of RRs for individual cancers attributed to tobacco smoking, based on primary data analysis from the Korean Cohort Consortium. The PAF was estimated using the Levin formula with past and current prevalence rates and the number of cancer cases and deaths, assuming a 15–year latency period.
RESULTS
The proportions of cancer cases and deaths in Korea attributable to tobacco smoking were similar to those calculated using Asian and global RRs for both men and women. In 2015 and 2020, tobacco smoking contributed to 14.32% and 13.17% of cancer cases and 21.70% and 20.69% of cancer deaths in adults, respectively. Among Koreans, smoking was responsible for 25.83% of new cancer cases in men in 2015, 23.49% in men in 2020, 1.46% in women in 2015, and 1.68% in women in 2020. In both years, smoking impacted mortality more strongly than incidence in Korean men and women (incidence in men: 25.83% and 23.49%; mortality in men: 32.09% and 30.41%; incidence in women: 1.46% and 1.68%; and mortality in women: 4.70% and 4.96%, respectively).
CONCLUSIONS
Tobacco smoking causes cancers and deaths in Korea, however, it is preventable. Effective control policies that consider trends and vulnerabilities among women are required.
Summary

Epidemiol Health : Epidemiology and Health
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