GBD 2021 is a comprehensive international effort that includes the estimation of prevalence, incidence and health burden for 371 diseases and injuries for 204 countries and territories. One iteration of the study was conducted in 2021 – the GBD 2021 – estimating the prevalence and burden of 12 mental disorders, including MDD.

Reference:

GBD 2021 Diseases and Injuries Collaborators. Global incidence, prevalence, years lived with disability (YLDs), disability-adjusted life-years (DALYs), and healthy life expectancy (HALE) for 371 diseases and injuries in 204 countries and territories and 811 subnational locations, 1990–2021: a systematic analysis for the Global Burden of Disease Study 2021. Lancet 2024; 403 (10440): 2133–2161.