No study has previously examined the worldwide impact of the Covid-19 pandemic on the prevalence of major depressive disorder and anxiety disorders in 2020. A comprehensive literature review was conducted to find demographic survey data released between January 1, 2020, and January 29, 2021, to achieve this result. The systematic review found 5,683 distinct data sources, 48 of which satisfied the inclusion criteria (one of which was reported across two regions).
The majority of research came from Western Europe (22) and high-income North America (14), with the rest coming from Australasia (5), high-income Asia Pacific (5), East Asia (2), and Central Europe (1).