Exposure measures	Specifications	Criteria required for depression
Antidepressant medications	ATC codes N06AB03, N06AB04, N06AB05, N06AB06, N06AB08, N06AB10, N06AF01, N06AG02, N06AX03, N06AX06, N06AX11, N06AX16, N06AX21, N06AX22	≥2 prescriptions reimbursed or outpatient contacts to a hospital within 6 months
Admission to a hospital	Main diagnosis of depression according to the ICD-10 classification F32.0, F32.1, F32.2, F32.3, F32.8, F32.9, F33.0, F33.1, F33.2, F33.3, F33.4, F33.8, F33.9	≥1 admission to a hospital
Outpatient contact to a hospital	Main diagnosis of depression according to the ICD-10 classification F32.0, F32.1, F32.2, F32.3, F32.8, F32.9, F33.0, F33.1, F33.2, F33.3, F33.4, F33.8, F33.9	≥2 prescriptions reimbursed or outpatient contacts to a hospital within 6 months
Categories of depression Recent depression: a woman was categorised under ‘recent depression’ from the date she met any of the three criteria for the first time. Previous depression: after 6 months, the woman was categorised under ‘previous depression’ for at least the following 54 months. Past depression: a woman was categorised under ‘past depression’ after at least 60 months from debut (of depression). No depression: a woman was categorised under ‘no depression’ if she had yet to meet any of the criteria. These were the reference group.

ATC = Anatomical Therapeutic Chemical Classification. ICD = International Classification of Diseases.