Depressive symptoms in younger adults before and during the COVID-19 pandemic: A nationally representative cross-sectional data analysis

Objective: Several studies have reported an increased prevalence of depressive symptoms during the coronavirus disease 2019 (COVID-19) pandemic. However, the prevalence of significant depressive symptoms and its associated factors in younger adults remain uncertain. We aimed to investigate this association during the COVID-19 pandemic and make a comparison with the pre-pandemic period.Methods: Cross-sectional data from the 2018 and 2020 Korea National Health and Nutrition Examination Surveys were analyzed, and 3281 respondents aged 19-40 years were included. We defined a Patient Health Questionnaire-9 score & GE; 10 as significant depressive symptoms and the categories of depressive symptoms were also classified as none, mild, moderate, and severe.Results: The prevalence of significant depressive symptoms was higher in the pandemic group (7.4% vs. 4.7%). Furthermore, the prevalence in the pandemic group was higher for all degrees: mild, moderate, and severe depressive symptoms. A multivariable logistic regression indicated that significant depressive symptoms during the pandemic was significantly associated with female sex, low educational attainment, unemployment, chronic medical disease, and being overweight.Conclusions: Our findings suggest an increase in depressive symptoms in younger adults during the pandemic. It is necessary to develop policies to provide younger adults with resources to cope with depressive symptoms related to COVID-19 and potential global outbreak of infectious disease.