Mental health before and during the COVID-19 pandemic: a longitudinal probability sample survey of the UK population
The potential impact of the COVID-19 pandemic on population mental health is of increasing global concern. Mental health was assessed using the 12-item General Health Questionnaire (GHQ-12) Waves 6–9 of the UKHLS had 53 351 participants. Prevalence of clinically significant levels of mental distress rose from 18 9% to 27 3 by April 2020.