Fig. 1

A 1-year monthly follow up of employee mental health plus local COVID-19 incidence. a) Boxplot of the 5-item Mental Health Index (MHI-5) by survey wave. b) Local regression estimate of MHI-5 score on exact response date (solid line) with 95% confidence intervals (dashed lines; note: these data start from June 2020, i.e., later than the official incidence data). c) Weekly incidence of COVID-19 locally (in Uusimaa region, total population 1.7 million). Solid line and left y-axis gives the incidence rates, whereas the dashed line and right y-axis re-state the time-smoothed average MHI-5 score from panel c for illustration purposes. Note: these incidence data are shown from beginning of the pandemic record up to our last survey response from the 12th survey wave #11). The incidence data are from the official open-access record by National Institute of Health and Welfare in Finland