Table 1.

Main variables available from each registry respectively in the SwePan database

Register	Variables
The Patient Register	Diagnoses (ICD-codes), divided into main and supplementary for each hospital visit Interventions during hospital stay (Swedish version of NOMESCO Classification of Surgical Procedures 1.9) Date of admission and discharge
The Prescribed Drug Register	Drug type and intended route of administration (ATC-code) Size of dispensed prescription (strength, no of doses, defined daily doses) Prescription text/instructions (freely written by the prescribing healthcare professional)
The Cancer Register	Tumour diagnosis (ICD codes) Date of diagnosis Tumour, nodes and metastases (TNM) classification, incl basis for diagnosis (autopsy, histopathology, cytology, radiology, etc)
The Cause of Death Register	Age, place and date of death Underlying cause of death (ICD codes)
The Register of the Total Population	Country and place of birth Civil status and number and age of any children Household information (municipality of residence, no of residents in household, disposable income, etc)
The Register on Participation in Education	Highest formal education categorised into: Did not complete compulsory school. Completed compulsory school. <3 years high school Completed high school. ≤3 years university studies. >3 years university studies. Postgraduate degree.

ATC, Anatomical Therapeutic Chemical; ICD, International Classification of Diseases.