Table 2.

The Finnish registers and their data content used in the MATEX project

Register	Data available	Register holder	Ref.
Medical Birth Register	Mother’s health data (incl. Smoking habits prior to and during pregnancy, other risk factors, interventions), pregnancy, delivery, live and stillbirths, GD, BMI, infant health data by age of 7 days	THL	[30]
Register of Induced Abortions	Data on mother, indication for induced abortion, diagnoses	THL	[38]
Register of Congenital Malformations	Mother’s health data, pregnancy, foetus/child, congenital anomalies and birth defects, diagnoses (ICD codes)	THL	[31]
Care Register for Health Care	Data from hospitals and special health care, diagnoses	THL	[33]
Register of Primary Health Care Visits	Data outpatient health care visits, diagnoses (available since 2011)	THL	[34]
Cancer Register	Persons with cancer, data on cancer type and death certificate	THL	[32]
Cause-of-Death Register	Causes of death, death certificates	Statistics Finland	[36]
Register of reimbursements for Prescription Medicines	Purchases of prescription medication eligible for reimbursement	KELAa	[35]
Finnish Maternity Cohort	Serum bank, data on mother, sampling date, expected due date, previous pregnancies	THLb	[42]
Population Register	Address history	Population Register Center	[37]

^aFinnish Social Security Institution; ^bFrom June 2017 the samples will be transferred to the Biobank Borealis of Northern Finland, established and maintained by the Northern Ostrobothnia Hospital District, the University of Oulu, NordLab and the hospital/healthcare districts of Lapland, Länsi-Pohja, Central Ostrobothnia and Kainuu