TABLE A1.

Description of data from linked population and health registers

	Description of contents
Population registers
Multi‐generation register	First‐order relatives that are also in the cohort
Total population register	Domestic migrations, emigration, immigration, vital status, date of death, birthyear and month, sex
LISA database	Education, profession, income
Others
Health registers
Inpatient and outpatient registers	Visits, inpatient episodes, diagnosis, interventions
Drug prescription register	Drug type, package size, date of pick‐up
Cause of death register	Cause of death, obduction, death date
Medical birth register	Detailed information on delivery of offspring and neonatal health status
Cancer register	Diagnosis, histopathology, TNM