… Our cross-lagged results also showed that online social comparison at T1 and T2 predicted
the … comparison on the reduction of psychological distress during the COVID-19 quarantine. …

… longitudinal changes intraindividually pre-COVID-19 versus during the first lockdown. This
concept stands in contrast to other currently available studies of longitudinal … the COVID-19 …

… slowed COVID-19 epidemic … a longitudinal pretest–posttest comparison group study design
to compare the daily growth rate of COVID-19 cases, and the daily growth rate of COVID-19-…

… large-scale, longitudinal data for the effects of Covid-19 on the mental health of … of COVID-19,
not because of differences in demographic characteristics. In the longitudinal comparison …

… We reviewed sixty-five longitudinal cohort studies comparing mental health prior to and
during the COVID-19 pandemic. In our primary meta-analysis (61 studies) of predominantly …

… Longitudinal data are needed to prospectively assess meaningful worsening of mental …
In this study, we use longitudinal data from a nationally representative sample of the United …

… Previous longitudinal studies conducted during the COVID-19 pandemic suggest that
mental health has been substantially affected both by the pandemic itself and the lockdown …

… Being fortunate to have very recent pre-COVID data, we … In June 2020, after three months of
COVID-19 lockdown, … for the same survey before the COVID-19 pandemic (December 2019). …

… For studies that have reported mental health problems before the COVID-19 pandemic,
we only extracted data from the time points during the COVID-19 pandemic. Therefore, to be …

… during the epidemic as a comparison group. To make a comparison, we first recruited
volunteers who had similar demographic characteristics of the COVID-19 survivor cohort. We …