Table 1.

Register data used in the study

Data Element	Register	Years	Variables
Neighbourhood characteristics	Statistics Denmark registers	1986-1998	Income, unemployment, education, and welfare benefits at the parish level
Baseline characteristics of individuals	Statistics Denmark registers	1986-1998	Country of origin, year of arrival, age, sex, marital status, and number of children
Inpatient psychiatric hospital stays	Psychiatric Central Register	1986-2019, February	ICD-8 and -10 and diagnosis dates
Contacts with outpatient psychiatric clinics and psychiatric emergency care units	Psychiatric Central Register	1995-2019, February	ICD-8 and -10 and diagnosis dates
Prescription of psychiatric medications	Prescription Drug Register	1995-2019, June	Anatomical Therapeutic Chemical codes and dates of prescription redemption

Abbreviation: ICD International Classification of Diseases

Note: Due to changes in the reporting standards for the patient registers we had access to a shorter follow-up time for the Psychiatric Central Register than the Prescription Drug Register.