https://ir.ymlib.yonsei.ac.kr/handle/22282913/168922 Tue, 12 May 2026 23:19:58 GMT 2026-05-12T23:19:58Z https://ir.ymlib.yonsei.ac.kr/handle/22282913/211937 Title: Physical activity domains and suicidal ideation: Findings from a nationally representative Korean survey Authors: Noh, Jieun; Kim, Lita; Hwang, Chaelin; Park, Eung Ju; Yang, Ji Su; Jung, Sun Jae Abstract: Background: Suicide is a major public health issue, and Korea has the highest suicide rate among OECD countries. Suicidal ideation is a precursor to suicide. Although physical activity benefits mental health, evidence for its link with suicidality is inconsistent, particularly regarding domain-specific effects. We examined domain-specific physical activity in relation to suicidal ideation in a nationally representative sample of Korean adults. Methods: We analyzed data from 31,723 adults aged >= 19 years in the Korea National Health and Nutrition Examination Survey (2015-2023). Suicidal ideation was self-reported, and physical activity was measured with the WHO Global Physical Activity Questionnaire. The Metabolic equivalent (MET)-minutes/week for work, leisure, and transportation time were calculated separately. Multiple logistic regression with survey weights was used, with subgroup analyses by sex, age, and occupation. Exploratory mediation analysis was conducted to examine depression as a mediator in association between domain-specific physical activity and suicidal ideation. Results: 4.8% of participants reported suicidal ideation. In men, high work activity remained significantly increased odds for suicide ideation, particularly among those aged 19-39 years (OR=2.21, 95% CI: 1.17-4.15) and in pink-collar workers (service and sales workers) (OR=3.36, 95% CI: 1.45-9.09), while high leisure activity was protective in those >= 60 years (OR=0.18, 95% CI: 0.07-0.48). No significant associations between physical activity and suicidal ideation were observed in women. Conclusions: Domain-specific physical activity was differentially associated with suicidal ideation. Work-related activity increased risk in certain male subgroups, whereas leisure-time activity was protective in older men, underscoring the need to consider activity context in suicide prevention. Wed, 01 Jul 2026 00:00:00 GMT https://ir.ymlib.yonsei.ac.kr/handle/22282913/211937 2026-07-01T00:00:00Z https://ir.ymlib.yonsei.ac.kr/handle/22282913/211778 Title: Early-life exposure to per-and polyfluoroalkyl substances and heavy metals and lower lung function in school-age children: A prospective cohort study Authors: Shin, Sanghee; Shin, Choong Ho; Lee, Young Ah; Lee, Yun Jeong; Hong, Yun-Chul; Lim, Youn-Hee; Kim, Bung-Nyun; Kim, Johanna Inhyang; Lee, Dong-Wook; Kim, Kyoung-Nam Abstract: Previous studies examining the associations of per-and polyfluoroalkyl substances (PFAS) and heavy metals (HMs) with lung function have yielded inconsistent findings. We investigated the associations of PFAS and HMs with lung function in a Korean birth cohort followed up to 10 years of age. Data from the Environment and Development of Children (EDC) cohort were used (n = 505). Serum PFAS and whole blood HM concentrations were measured at ages 2, 4, and 6 years. Lung function was assessed at ages 8 and 10 years. Linear mixed models were used to evaluate the associations of individual chemicals with repeated lung function measurements. Principal component analysis (PCA) within a doubly robust estimation framework was applied to examine the associations between chemical mixtures and lung function. In analyses for individual chemicals, several PFAS (e. g., perfluorooctanoic acid [PFOA] and linear perfluorooctane sulfonate [L-PFOS]) and HMs (e.g., mercury and cadmium), particularly those measured at age 2, were associated with lower lung function. In mixture analyses, higher age-2 PCA-derived exposure patterns characterized by PFAS-dominant components were associated with lower FEF25-75 [beta = 0.04, 95% confidence interval (CI): 0.01, 0.07], whereas higher age-2 HM-dominant components were associated with lower FEV1/FVC (beta = 1.33, 95% CI: 0.63, 2.03) at 8-10 years. These findings suggest that early-life exposure to PFAS-and HM-dominant mixtures, particularly around age 2 years, may adversely influence subsequent lung function. Our results highlight the importance of early-life prevention strategies to minimize exposure to these ubiquitous chemicals, particularly around 2 years of age. Mon, 01 Jun 2026 00:00:00 GMT https://ir.ymlib.yonsei.ac.kr/handle/22282913/211778 2026-06-01T00:00:00Z https://ir.ymlib.yonsei.ac.kr/handle/22282913/211941 Title: Cardiovascular disease risk across subsectors and occupations in the transportation and storage industry: a national cohort study Authors: Oh, Juyeon; Park, Heejoo; Lee, Jian; Lee, Jongmin; Yun, Byungyoon; Yoon, Jin-ha Abstract: Cardiovascular disease (CVD) is a major contributor to global morbidity and mortality. While the transportation industry is recognized as high-risk for CVD, variation across subsectors and occupations remains unclear. We evaluated CVD risk across subsectors and occupations in South Korea's transportation industry. This retrospective cohort study used linked data from Korean National Health Insurance Service and Employment Insurance databases. Male workers aged 35-54 years in 2013 who remained in the same occupation during 2012 and underwent health screening in 2012-2013 were included. Follow-up continued through 2022. We calculated age-standardized incidence rates, standardized incidence ratios (SIRs), and population-attributable fractions across industries, with stratified analyses by subsector, occupation and lifestyle factors. Among 2 300 512 workers, transportation industry exhibited the highest age-standardized CVD incidence rate (558.9 per 100 000 person-years) and population-attributable fraction (1.49%) of all industries. Within 182 551 transportation workers, driving-related occupations showed the highest SIRs, especially in land and freight subsectors. Aviation subsectors had lower CVD incidence and more favorable health indicators. These patterns remained consistent after stratification by obesity and smoking status. Substantial heterogeneity exists in CVD risk across transportation subsectors and occupations. Targeted prevention strategies are needed for high-risk groups, particularly drivers. Mon, 01 Jun 2026 00:00:00 GMT https://ir.ymlib.yonsei.ac.kr/handle/22282913/211941 2026-06-01T00:00:00Z https://ir.ymlib.yonsei.ac.kr/handle/22282913/211943 Title: The value of in-person schooling during times of educational disruption: Impacts on students' emotional problems and subjective well-being Authors: Hahn, Youjin; Kim, Hyuncheol Bryant; Kim, Minjeong Joyce; Yang, Hee-Seung Abstract: This study examines the effects of large-scale school closures on the emotional problems and subjective wellbeing among primary school students in South Korea. Using administrative records on in-person school days and panel survey data from 2018 to 2022, we find that more in-person schooling during the pandemic reduces students' emotional problems-such as aggression, social withdrawal, and psychosomatic symptoms-and improves self-reported health. These gains are smaller for students with lower socioeconomic status, highlighting inequalities in the emotional benefits of school reopening. Importantly, the benefits persist: students with greater in-person exposure in 2020 continued to report better emotional health and higher subjective well-being for at least two subsequent years. We also find that stronger interpersonal relationships and healthier time use are associated with these sustained improvements. Mon, 01 Jun 2026 00:00:00 GMT https://ir.ymlib.yonsei.ac.kr/handle/22282913/211943 2026-06-01T00:00:00Z