Table 1.

Demographic variables

Demographic variables	Operationalisation
Age	Years
Gender	Male/female
Ethnicity	Country of birth, country of birth parents
Age of migration	If applicable
Ethnic density	Postal code (first 4 figures)
Previous mental healthcare	If yes: diagnosis
Previous/current medication	(free text words)
Social economic status	Income
Education	(free text words)
Religion	How important is religion for you? (Likert scale)
Substance use	First 3 questions of the Drug Use Disorders Identification Test (DUDIT)+question on kind of substance used