TableĀ 1

Demographic variables

Demographic variablesOperationalisation
EthnicityCountry of birth, country of birth parents
Age of migrationIf applicable
Ethnic densityPostal code (first 4 figures)
Previous mental healthcareIf yes: diagnosis
Previous/current medication(free text words)
Social economic statusIncome
Education(free text words)
ReligionHow important is religion for you? (Likert scale)
Substance useFirst 3 questions of the Drug Use Disorders Identification Test (DUDIT)+question on kind of substance used