Mental health and sociodemographic influences during COVID-19: Longitudinal findings from Iceland.

The COVID-19 pandemic introduced numerous stressors and challenges that have had profound implications for mental health. This study examined the effects of the pandemic on mental health among Icelandic adults (n = 1766), using longitudinal survey data spanning three waves of data collection from 2019 to 2022. Symptoms of depression, anxiety, and stress increased from the beginning of the pandemic to the second time point, approximately one year into the pandemic, coinciding with reductions in happiness and social support.