Table 4.

Potential register linkages in the TERTTU Survey

National register	Type of information
Population Register Centre	Place of residence, marital status and nationality.
Ministry of Employment and the Economy	Use of employment services and participation in activities for promoting employment.
Social Insurance Institution of Finland	Social benefits and reimbursements for medical costs.
National Institute for Health and Welfare	Number and reasons for healthcare visits and hospital care, procedures and treatments.
Statistics Finland	Socioeconomic position, education and causes of death.