Table 1 Overview of selection criteria for estimates of prevalence for priority health conditions in 2020

1

Population survey

World Mental Health (WMH) Survey [39]

Multistage household probability sample with case–control design

Fully structured diagnostic interview using the World Mental Health Composite International Diagnostic Interview (WMH—CIDI)

Part 1—Core diagnostic assessment administered by trained interviewer

Part 2—Respondents who meet criteria for any disorder in Part 1 + subsample of ~ 25% of non-criteria respondents

Depression, alcohol use disorder, and drug use disorders

2

Meta analysis

World Alzheimer’s Report [45]

Systematic literature review conducted via PubMed/Medline for population-based studies among people 60 + years^a

Dementia

3

Primary research

Al Rajeh et al. [41]

Community sample of N = 23,700 Saudis in Thugbah with case control

Part 1—Structured interview was carried out by trained interviewer using WHO protocol for detecting neurological disorders

Part 2—Individuals identified as having a neurological disorder were evaluated by a neurologist

Epilepsy

4

Simulation

WHO Global Health Observatory [40]

Statistical modeling performed using data from regional health observatories and international agencies with consultation from member states and experts. Includes household surveys, civil registration of vital events, and institution-based sources (administrative and health facilities)

Suicidal ideation

5

Simulation

IHME Global Burden of Disease [45]

Statistical modeling incorporates data from censuses, national surveys, primary research, births, and vital registration

Bipolar disorder,b child intellectual and development disorders, child conduct/behavioral disorders, and child emotional disorders