Table 1.

Overview of variables and data collection

Variable	Data collection
Personal identification number	Company and Union registers Questionnaire The Danish Civil Registration System Registers at Statistics Denmark National Patient Registry Register of Causes of Death The Danish National Prescription Registry Data from Department of Environmental Science, Aarhus University
Occupational group*	Company and Union registers Questionnaire
Date for start of employment*	Company and Union registers Questionnaire
Job function*	Company and Union registers Questionnaire
Physical loads*	Company statistics Observations and measurements Questionnaire
Date of first hospital contact†	National Patient Registry
Diagnosis†	National Patient Registry
Surgical codes†	National Patient Registry
Date of death†	Register of Causes of Death
Cause of death†	Register of Causes of Death
Weight, height, leisure time physical activity, smoking status, alcohol‡	Questionnaire
Educational level‡	Registers at Statistics Denmark
Marital status‡	Registers at Statistics Denmark
Country of origin‡	Registers at Statistics Denmark
Average pollution at residence‡	Data from the Department of Environmental Science, Aarhus University

*Exposure variables.

†Outcome variables.

‡Potential confounders.