Epidemiology and Health最新文献

{"title":"Evaluation of gestational age by pregnancy outcomes and distribution of pregnancy-related codes in Korean claims data.","authors":"Woo-Jung Kim, Yunha Noh, Yongtai Cho, Eun-Young Choi, HyunJoo Lim, Hyesung Lee, Ju-Young Shin","doi":"10.4178/epih.e2026007","DOIUrl":"10.4178/epih.e2026007","url":null,"abstract":"<p><strong>Objectives: </strong>This study aimed to evaluate a fixed-duration algorithm for gestational age (GA) estimation according to pregnancy outcomes and to describe the GA distribution of pregnancy-related codes in Korea.</p><p><strong>Methods: </strong>We included 351,055 pregnancy episodes (2019-2022) from linked data between the National Health Insurance Service and the Korea Immunization Registry Information System (KIRIS). GA from claims data was estimated by subtracting fixed durations from the delivery date (algorithm-based GA), and GA derived from KIRIS was defined as the gold standard. Accuracy was evaluated as the proportion of episodes in which the difference between the estimated GA and the reference standard fell within ±2 weeks. We described the distributions of the GA at which each prenatal test, pregnancy complication, and diagnostic code was recorded.</p><p><strong>Results: </strong>Algorithm-based GA estimation showed high accuracy for live births (92.2% within ±2 weeks) but markedly lower accuracy for non-live birth outcomes, including stillbirth (3.3%), termination (7.2%), spontaneous abortion (45.2%), and ectopic pregnancy (20.0%). In additional analyses aimed at identifying potential indicators for improving GA estimation, most events occurred within clinically expected timeframes, although some individual codes exhibited poor temporal alignment.</p><p><strong>Conclusions: </strong>Algorithm-based GA estimation using claims data performed well for live births but demonstrated limited accuracy for non-live birth outcomes. Incorporating information from prenatal tests and pregnancy complications may enhance GA estimation.</p>","PeriodicalId":48543,"journal":{"name":"Epidemiology and Health","volume":" ","pages":"e2026007"},"PeriodicalIF":2.4,"publicationDate":"2026-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC13033438/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146127013","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Risk of Parkinson disease according to metabolic syndrome among Korean adults: an analysis of data from the National Health Insurance-National Sample Cohort.","authors":"Je-Hyun Kim, Hae-Sung Nam, Ju-Mi Lee","doi":"10.4178/epih.e2026024","DOIUrl":"10.4178/epih.e2026024","url":null,"abstract":"<p><strong>Objectives: </strong>This study investigated the association of metabolic syndrome (MetS) and its components with the risk of developing Parkinson disease (PD) among Korean adults using the National Health Insurance Service-National Sample Cohort (NHIS-NSC).</p><p><strong>Methods: </strong>We analyzed 363,602 adults aged ≥40 years without a prior diagnosis of PD who underwent national health examinations between 2010 and 2014, using data from the NHIS-NSC version 2.2 database. Participants were categorized into MetS and non-MetS groups and were followed from the baseline examination until PD diagnosis, death, or December 31, 2019. Cox proportional hazards models were used to estimate hazard ratios (HRs) and 95% confidence intervals (CIs), with sequential adjustment for covariates.</p><p><strong>Results: </strong>During a mean follow-up of 8.2 years, 2,834 incident PD cases were identified. In the fully adjusted Cox model, MetS was associated with a significantly higher risk of developing PD (HR, 1.22; 95% CI, 1.13 to 1.31). Among the individual MetS components, abdominal obesity (HR, 1.19; 95% CI, 1.10 to 1.29) and elevated fasting blood glucose (HR, 1.20; 95% CI, 1.11 to 1.29) were significantly associated with an increased risk of PD. PD incidence also increased as the number of MetS components increased (log-rank p<0.001).</p><p><strong>Conclusions: </strong>These findings suggest that MetS and its components, particularly abdominal obesity and hyperglycemia, are associated with an increased risk of PD. Effective management of MetS may therefore help reduce the future burden of PD.</p>","PeriodicalId":48543,"journal":{"name":"Epidemiology and Health","volume":" ","pages":"e2026024"},"PeriodicalIF":2.4,"publicationDate":"2026-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC13503066/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148213006","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Cohort profile: a multicenter hospital-based cohort of tuberculosis and non-tuberculous mycobacterial pulmonary disease in Korea, 2015-2024.","authors":"Hyun Ji Woo, Min-Gul Kim, Gaeun Kang, Jaehee Lee, Jeongha Mok, Yeong Hun Choe, Yong-Soo Kwon","doi":"10.4178/epih.e2026028","DOIUrl":"10.4178/epih.e2026028","url":null,"abstract":"<p><p>Tuberculosis and non-tuberculous mycobacterial pulmonary disease (NTM-PD) are major causes of chronic respiratory morbidity, yet detailed multicenter clinical data remain limited. We established a retrospective multicenter cohort using electronic medical records from 4 national university-affiliated tertiary hospitals in Korea. Eligible participants included patients with tuberculosis registered in the Korean National Tuberculosis Surveillance System and patients who met modified 2007 American Thoracic Society/Infectious Diseases Society of America microbiological criteria for NTM-PD between 2015 and 2024. De-identified, standardized datasets were created using common data specifications and harmonized at a central coordinating center. The cohort included 11,790 patients with tuberculosis and 5,145 patients with NTM-PD. Tuberculosis notifications declined steadily from 1,657 cases in 2015 to 580 cases in 2024, whereas NTM-PD showed an overall upward trend despite a modest decrease in the final year. Mycobacterium avium complex accounted for 78.7% of NTM-PD cases, with M. intracellulare and M. avium as the predominant species. Macrolide-based multidrug regimens were used consistently throughout the study period. This cohort profile describes the registry design, case definitions, data structure, and key baseline findings; the registry provides a platform for future clinical, epidemiological, and health-services research on mycobacterial disease in Korea.</p>","PeriodicalId":48543,"journal":{"name":"Epidemiology and Health","volume":" ","pages":"e2026028"},"PeriodicalIF":2.4,"publicationDate":"2026-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148266891","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Age- and disability-based trends in potentially preventable hospitalizations: evidence from nationwide claims data in Korea.","authors":"Hyejung Yoon, Boyoung Jeon, Seyune Lee, Daesung Choi, Se-Youn Jung, Dong-Min Son, Yong Joo Rhee, Juhyeon Moon, So Youn Park, In-Hwan Oh, Young-Il Jung","doi":"10.4178/epih.e2026012","DOIUrl":"10.4178/epih.e2026012","url":null,"abstract":"<p><strong>Objectives: </strong>Individuals with disabilities are at greater risk of hospitalization than the general population. We examined 10-year trends in potentially preventable hospitalizations (PPH) in Korea, comparing individuals with and without disabilities and assessing age-specific patterns.</p><p><strong>Methods: </strong>Using National Health Information Database claims data (2010-2019), we established a fixed cohort of newly registered individuals with disabilities and control subjects statistically matched (1:1.5) at baseline. Annual PPH rates among patients with each condition were calculated and age- and sex-standardized according to Organization for Economic Cooperation and Development Health Care Quality Indicators definitions. Trends and annual percent changes (APCs) were analyzed by disability status and age group (non-older: 30-64; older adults: ≥65 years).</p><p><strong>Results: </strong>Between 2010 and 2019, PPH rates declined significantly in both groups. Among individuals with disabilities, the steepest decline was observed for hypertension (APC, -15.7%; 95% confidence interval [CI], -17.7 to -13.7), whereas congestive heart failure showed the largest reduction among individuals without disabilities (APC, -7.8%; 95% CI, -10.8 to -4.7). Declines were generally greater among non-older adults aged 30-64 years, regardless of disability status. The disparity between disability and non-disability groups narrowed over the decade, primarily due to larger improvements among non-older adults. Older adults with disabilities consistently exhibited the highest PPH rates for most conditions, whereas younger individuals with disabilities had the highest rates for diabetes.</p><p><strong>Conclusions: </strong>PPH rates declined over the decade among both individuals with and without disabilities, particularly for hypertension and among non-older adults. However, older adults with disabilities remain at elevated risk, underscoring the need for targeted strategies to improve access to community-based primary care.</p>","PeriodicalId":48543,"journal":{"name":"Epidemiology and Health","volume":" ","pages":"e2026012"},"PeriodicalIF":2.4,"publicationDate":"2026-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC13219979/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147366994","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Association between hospital characteristics and 30-day mortality after acute stroke: a multilevel study in Korea.","authors":"Joo Won Park, Myoung-Hee Kim","doi":"10.4178/epih.e2026030","DOIUrl":"10.4178/epih.e2026030","url":null,"abstract":"<p><strong>Objectives: </strong>Stroke is the fourth leading cause of death in Korea and shows substantial regional variation in mortality. Although timely medical care can reduce premature death and disability, few studies have examined hospital-level factors associated with stroke outcomes. This study aimed to identify hospital-level factors associated with acute stroke mortality and to determine optimal resource levels for high-quality care.</p><p><strong>Methods: </strong>This nationwide retrospective cohort study analyzed patients with acute stroke in Korea from 2018 to 2020 using the National Health Insurance Service claims database and Medical Resource Report data. The outcome was all-cause mortality within 30 days of admission. Individual-level variables included socio-demographic characteristics, the Charlson comorbidity index, and the stroke severity index. Hospital-level variables included the number of beds, specialists, neurologists/neurosurgeons, and nurses, as well as accreditation level and stroke center designation status. Hierarchical logistic regression using generalized linear mixed models and change-point analysis were used to determine optimal resource thresholds.</p><p><strong>Results: </strong>Change-point analysis identified critical thresholds associated with reduced mortality: 600 hospital beds, 25 specialists, 8 neurologists and neurosurgeons, and 540 nurses. Multilevel analysis showed that patients treated in hospitals with fewer than 600 beds (odds ratio [OR], 1.13; p=0.013), fewer than 8 neurologists and neurosurgeons (OR, 1.15; p=0.004), and no stroke intervention capacity (OR, 1.05; p=0.037) had a significantly higher risk of 30-day mortality.</p><p><strong>Conclusions: </strong>The identified thresholds provide baseline data that may guide development of medical systems tailored to local characteristics and support the timely delivery of high-quality medical services. These findings suggest that each health service areas should include hospitals that meet minimum resource standards to improve stroke outcomes.</p>","PeriodicalId":48543,"journal":{"name":"Epidemiology and Health","volume":" ","pages":"e2026030"},"PeriodicalIF":2.4,"publicationDate":"2026-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148266905","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Normal liver enzymes do not indicate safety from alcohol-related liver disease: evidence from a Korean nationwide cohort.","authors":"Yeon Woo Oh, Jun Young Park, Eun-Cheol Park","doi":"10.4178/epih.e2026004","DOIUrl":"10.4178/epih.e2026004","url":null,"abstract":"<p><strong>Objectives: </strong>This study examined whether individuals with consistently normal liver enzyme levels are protected from alcohol-related liver disease and investigated whether heavy drinking increases liver disease risk independent of normal biomarker status.</p><p><strong>Methods: </strong>We conducted a nationwide cohort study using Korean National Health Insurance Service data (2002-2019), including 19,035 participants aged ≥40 years who maintained normal liver enzyme levels (aspartate aminotransferase ≤40 μ/L, alanine aminotransferase ≤40 μ/L, gamma-glutamyl transferase ≤63 μ/L for men and ≤35 μ/L for women) across multiple examinations conducted between 2002 and 2008. Participants were categorized as abstainers (≤1 time/mo), moderate drinkers (≤2 times/wk), and heavy drinkers (≥3 times/wk). Primary outcomes included incident liver disease identified using diagnostic codes. Cox proportional hazards models were used to estimate hazard ratios (HRs), with age-stratified analyses performed.</p><p><strong>Results: </strong>Heavy drinkers demonstrated a significantly higher risk of liver disease than abstainers (HR, 1.73; 95% confidence interval [CI], 1.40 to 2.14), whereas moderate drinkers showed no significant association (HR, 1.06; 95% CI, 0.94 to 1.19). Consistent patterns emerged for middle-aged adults (40-69 years), with attenuated effects among participants aged ≥70 years. When alcoholic liver disease was analyzed specifically, both moderate (HR, 1.29; 95% CI, 1.05 to 1.58) and heavy drinkers (HR, 2.86; 95% CI, 2.09 to 3.91) exhibited significantly increased hazards.</p><p><strong>Conclusions: </strong>Despite normal liver enzyme levels, heavy alcohol consumption was associated with a significantly increased risk of liver disease. These findings challenge current reactive screening paradigms relying solely on biomarker abnormalities and support proactive alcohol counseling regardless of enzyme results. More sensitive strategies are needed for early detection of alcohol-related liver injury.</p>","PeriodicalId":48543,"journal":{"name":"Epidemiology and Health","volume":" ","pages":"e2026004"},"PeriodicalIF":2.4,"publicationDate":"2026-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC13033442/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146087600","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Association between long-term PM2.5 exposure and risk of urticaria and allergic rhinitis in Korean children: a nationwide longitudinal cohort study.","authors":"Young A Park, Hyemin Jang, Whanhee Lee, Jongmin Oh, Jung Won Lee, Hae Soon Kim, Jung Eun Choi, Rosie Lee, Ji Hyen Lee, Eun-Hee Ha","doi":"10.4178/epih.e2026020","DOIUrl":"10.4178/epih.e2026020","url":null,"abstract":"<p><strong>Objectives: </strong>Exposure to air pollutants is well established as being associated with the development and exacerbation of asthma. However, relatively few studies have examined the relationship between fine particulate matter (PM2.5) exposure and the risk of urticaria and allergic rhinitis (AR). Therefore, this study aimed to investigate the associations between long-term PM2.5 exposure and the risks of urticaria and AR.</p><p><strong>Methods: </strong>We analyzed data from the Korean National Health Insurance Service-National Sample Cohort spanning 2002 to 2019. The cohort included individuals enrolled from birth and followed until the onset of urticaria or AR. Annual PM2.5 exposure was estimated using validated machine learning-based prediction models with high spatial resolution across mainland Korea. At the initial healthcare visit, urticaria and AR were identified based on primary diagnostic codes from the 10th revision of the International Classification of Diseases. Cox proportional hazards models with time-varying exposures and confounders were used to estimate hazard ratios (HRs) and 95% confidence intervals (CIs) for the risks associated with a 5 μg/m3 increase in annual PM2.5 concentration.</p><p><strong>Results: </strong>During follow-up, 364,227 individuals aged 0-18 years at enrollment were included, among whom 151,508 developed urticaria and 258,041 developed AR. The mean PM2.5 concentration at baseline was 29.6 μg/m3 (standard deviation, 3.1). The HR per 5 μg/m3 increase in annual PM2.5 concentration was 1.02 (95% CI, 1.01 to 1.03) for urticaria and 1.06 (95% CI, 1.05 to 1.07) for AR.</p><p><strong>Conclusions: </strong>In this nationwide cohort, long-term exposure to PM2.5 was associated with the incidence of urticaria and AR. These findings provide important evidence for strategies aimed at preventing urticaria and AR in children.</p>","PeriodicalId":48543,"journal":{"name":"Epidemiology and Health","volume":" ","pages":"e2026020"},"PeriodicalIF":2.4,"publicationDate":"2026-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC13503059/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147934816","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Cohort profile: Airborne Hazards and Open Burn Pit Registry (AHOBPR).","authors":"Nisha Jani, Israel C Christie, Azizur Rahman, Tianshi D Wu, Sherrie L Hill, William B Wallin, Eric E Shuping, Anays M Sotolongo, Drew A Helmer, Michael J Falvo","doi":"10.4178/epih.e2026036","DOIUrl":"10.4178/epih.e2026036","url":null,"abstract":"<p><p>The Airborne Hazards and Open Burn Pit Registry (AHOBPR) was established by the Department of Veterans Affairs and Department of Defense in response to United States Public Law 112-260 (2013). This registry ascertains and monitors health effects among veterans and service members who may have been exposed to airborne hazards during their military deployments. AHOBPR allows researchers to monitor health effects among veterans possibly exposed to airborne hazards during deployment and explore health effects with the goal of improving veteran care. Eligibility is limited to Veterans and service members who served in combat theaters specified in law, including areas relevant to Operations: Desert Shield and Desert Storm; Iraqi Freedom; Enduring Freedom; and New Dawn. This cohort profile includes data on Veterans and service members (n=497,208) who enrolled in the AHOBPR and completed the online questionnaire June 1, 2014, to September 20, 2024. The online questionnaire captured deployment information, exposure and health concerns, health history, activity limitations, and additional risk factors that may affect a service member's health. The optional medical evaluation by a clinician documenting health status and concerns in a note template in the electronic medical record was completed for 174,247 (35.0%) participants.</p>","PeriodicalId":48543,"journal":{"name":"Epidemiology and Health","volume":" ","pages":"e2026036"},"PeriodicalIF":2.4,"publicationDate":"2026-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148670965","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Knowledge, attitudes, and practices regarding myopia prevention among primary school students in a province in Vietnam's Central Highlands: a cross-sectional study.","authors":"Quang Minh Lam, My Nguyen Ngoc Thai, Lanh Thi My Vuu","doi":"10.4178/epih.e2026034","DOIUrl":"10.4178/epih.e2026034","url":null,"abstract":"<p><strong>Objectives: </strong>This study assessed the prevalence of adequate knowledge, positive attitudes, and good practices regarding myopia prevention among fourth-grade and fifth-grade students and investigated the relationships between these knowledge, attitude, and practice domains and student characteristics in a resource-constrained setting.</p><p><strong>Methods: </strong>This cross-sectional study included fourth-grade and fifth-grade students at Nguy Nhu Primary School, Kon Tum City, Kon Tum Province, Vietnam, in 2023. Data were collected using a structured self-administered questionnaire. A total of 545 students were included in the final analysis.</p><p><strong>Results: </strong>The proportion of participants with previously diagnosed myopia was 21.1%. Regarding myopia prevention, 66.6% of students had adequate knowledge, 35.6% had positive attitudes, and 56.7% demonstrated good practices. Female students were more likely than male students to have adequate knowledge (adjusted prevalence ratio [aPR], 1.46; 95% confidence interval [CI], 1.29 to 1.65) and positive attitudes (aPR, 2.24; 95% CI, 1.72 to 2.92). Adequate knowledge was associated with higher prevalences of both positive attitudes (aPR, 8.57; 95% CI, 4.51 to 16.57) and good practices (aPR, 1.96; 95% CI, 1.59 to 2.42).</p><p><strong>Conclusions: </strong>Categorical analysis suggested a mediating role for positive attitudes, but continuous sensitivity analysis indicated that this pathway was not statistically robust. The findings suggest that adequate general knowledge was the most direct and consistent correlate of good preventive practices, although cognitive overlap between knowledge and attitudes is expected in this age group. Interventions should prioritize actionable health literacy.</p>","PeriodicalId":48543,"journal":{"name":"Epidemiology and Health","volume":" ","pages":"e2026034"},"PeriodicalIF":2.4,"publicationDate":"2026-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148438442","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Korea Youth Risk Behavior Survey: achievements in the last 20 years and future directions.","authors":"Yangha Kim, Yunjung Choi, Suyeon Park, Ji-Su Park, Sun-Ja Kim, Yoonjung Kim, Sungha Yun, Sunhye Choi, Soyeon Kim, Kyungwon Oh","doi":"10.4178/epih.e2026025","DOIUrl":"10.4178/epih.e2026025","url":null,"abstract":"<p><p>The Korea Youth Risk Behavior Survey (KYRBS) has been conducted annually by the Korea Disease Control and Prevention Agency (KDCA) since 2005 to monitor trends in health behaviors among Korean adolescents, with the 20th survey completed in 2024. Each year, approximately 60,000 middle and high school students participate in an anonymous, self-administered, web-based survey comprising approximately 110 health behavior items. Over the past 20 years, school-level and student-level participation rates averaged 99.8% and 94.9%, respectively, with a cumulative total of 1,304,561 participants. The prevalence of current cigarette smoking decreased from 11.8% (male, 14.3%; female, 8.9%) in 2005 to 3.6% (male, 4.8%; female, 2.4%) in 2024, and the prevalence of current drinking decreased from 27.0% (male, 27.0%; female, 26.9%) to 9.7% (male, 11.8%; female, 7.5%). In contrast, the prevalence of skipping breakfast increased from 27.1% (male, 26.4%; female, 28.0%) to 42.4% (male, 40.2%; female, 44.7%), whereas the prevalence of depressive symptoms showed little overall change (29.9% [male, 25.6%; female, 34.7%] in 2005 and 27.7% [male, 23.1%; female, 32.5%] in 2024). Survey data are released within the same year of collection and have been used as key evidence for the development and evaluation of adolescent health policies, including the Master Plans for Student Health Promotion and the National Health Plan in Korea. The KYRBS will continue to develop new survey items reflecting emerging health issues, expand the target population to include children, and regularly produce regional-level adolescent health statistics, thereby maintaining its role as a key national health surveillance system.</p>","PeriodicalId":48543,"journal":{"name":"Epidemiology and Health","volume":" ","pages":"e2026025"},"PeriodicalIF":2.4,"publicationDate":"2026-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC13503065/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148266880","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}