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BackgroundsAn outbreak of lung injury among South Korean adults was examined in a hospital-based case-control study, and the suspected cause was exposure to humidifier disinfectant (HD). However, a case-control study with community-dwelling controls was needed to validate the previous study’s findings, and to confirm the exposure-response relationship between HD and lung injury.MethodsEach case of lung injury was matched with four community-dwelling controls, according to age (±3 years), sex, residence, and history of childbirth since 2006 (for women). Environmental risk factors, which included type and use of humidifier and HD, were investigated using a structured questionnaire during August 2011. The exposure to HD was calculated for both cases and controls, and the corresponding risks of lung injury were compared.ResultsAmong 28 eligible cases, 16 patients agreed to participate, and 60 matched controls were considered eligible for this study. The cases were more likely to have been exposed to HD (odds ratio: 116.1, 95% confidence interval: 6.5–2,063.7). All cases were exposed to HDs containing polyhexamethyleneguanidine phosphate, and the risk of lung injury increased with the cumulative exposure, duration of exposure, and exposure per day.ConclusionsThis study revealed a statistically significant exposure-response relationship between HD and lung injury. Therefore, continuous monitoring and stricter evaluation of environmental chemicals’ safety should be conducted.

This study investigated the relationships among psychosocial factors that contribute to smartphone dependency among South Korean adolescents. This cross-sectional study involved the secondary data analysis of the 2016 Korean Children and Youth Panel Survey, a nationwide multistage cluster survey. Data were collected from 1,840 7th grade students in South Korea and analyzed with descriptive statistics, Pearson's correlation coefficients, and a path analysis using SPSS 21.0 and AMOS 23.0. The path analysis showed that selfesteem and aggressiveness directly influenced smartphone dependency, while affective parenting attitude, peer attachment, resilience, self-esteem, and depressive symptoms indirectly influenced it. The explanatory variables accounted for 18.3% of the total variance. In conclusion, parents' education on positive parenting and guidance concerning adolescents' smartphone use is necessary to reduce adolescents' smartphone dependency. It may also prove effective to promote adolescents' interpersonal skills and self-esteem to foster positive peer relationships and self-control concerning smartphone use.

Background The role of the father as a co-caregiver is becoming increasingly important across cultures. Parental psychological distress is an influencing factor of maladaptive parenting behaviors and negative psychosocial outcomes in children. Considerable research has focused on psychological distress in parents, commonly experienced during the childrearing years; however, the relationship between paternal psychological distress and fathers’ involvement in childcare has been less studied. This study aimed to examine this relationship. Methods This study explored the relationship between parental psychological distress and fathers’ involvement in childcare by analyzing data from 1541 children and their parents from the 2011 Panel Study on Korean Children. Psychological distress was assessed using the Kessler 6-Item Psychological Distress Scale. Fathers’ involvement in childcare was measured in terms of the quality and quantity of involvement, using a Father’s Childcare Involvement Scale completed by mothers and the daily hours spent by fathers in childcare . Results The mean scores for paternal and maternal psychological distress were 5.26 ± 4.20 and 5.79 ± 4.42, respectively; for the quality of fathers’ involvement in childcare, 14.46 ± 2.63; and for the quantity of fathers’ involvement, 2.53 ± 1.62. Paternal psychological distress was significantly correlated with maternal psychological distress and fathers’ involvement in childcare. Maternal psychological distress demonstrated a partial mediating effect on the relationship between paternal psychological distress and the quality of fathers’ involvement in childcare for preschool-aged children (β = −.085, p < .001); this effect was significant (Sobel test; Z = 3.13, p = .002). Further, maternal psychological distress demonstrated a complete mediating effect on the relationship between paternal psychological distress and the quantity of fathers’ involvement in childcare (β = −.065, p = .018); this effect too was significant (Sobel test; Z = 2.38, p = .018). Conclusions Paternal psychological distress influenced the quality and quantity of fathers’ involvement in childcare and was mediated by maternal psychological distress. To promote fathers’ involvement in childcare, a family-centered approach for childcare should reflect the triadic interaction of father–mother–child. These findings have implications for primary health professionals, as well as policymakers who design community health programs for early childhood.