Table 1.

The data sources of the project.

Data source	Type of data source	Information to be included in the present project
The Danish Labor Force Survey [24]	Survey data obtained from interviews on random samples of the population of Denmark	Date of the interview, employment status, type of employment contract, and nighttime work
The Central Person Register [17]	National register, which covers all residents of Denmark	Gender, age, date of migration, and date of death
The Employment Classification Module [18]	National register, which covers all residents of Denmark	Industry sector
The Danish Education Registers [19]	National register, which covers all residents of Denmark	Educational level
The Danish Family Income Register [20]	National register, which covers all residents of Denmark	Equalized disposable family income
The Danish Register for Evaluation of Marginalisation [21]	National register, which covers all residents of Denmark	Date of welfare benefits payment and type of welfare benefits payment
The Psychiatric Central Research Register [22]	National register, which covers all residents of Denmark	Date of hospital contact and principal diagnosis (ICD-10a code)
The National Prescription Register [23]	National register, which covers all residents of Denmark	Date of redeemed prescription and type of medicine (ATCb-code)

^aICD-10: International Statistical Classification of Diseases and Related Health Problems, 10th Revision.

^bATC: Anatomical Therapeutic Chemical Classification System.