Norway has a long-standing tradition in twin research, but the data collected in several population-based twin studies were not coordinated centrally or easily accessible to the scientific community.

In 2009, the Norwegian Twin Registry was established at the Norwegian Institute of Public Health (NIPH) in Oslo with the purpose of creating a single research resource for Norwegian twin data. As of today, the Norwegian Twin Registry contains 47,989 twins covering birth years 1895–1960 and 1967–1979; 31,440 of these twins consented to participate in health-related research. In addition, DNA from approximately 4,800 of the twins is banked at the NIPH biobank and new studies are continually adding new data to the registry. The value of the Norwegian twin data is greatly enhanced by the linkage opportunities offered by Norway's many nationwide registries, spanning a broad array of medical, demographic, and socioeconomic information.

The NTR supports a broad range of research interests in physical health, mental health and we have recently become engaged in an EU project (HEALS - Health and Environment-wide Associations based on Large population) that includes several European twin registries to help understand the exposome and how environmental exposures affect health.

Review articles on Norwegian twin data:

The Norwegian Twin Registry. Nilsen TS, Brandt I, Magnus P, Harris JR.Twin Res Hum Genet. 2012 Dec;15(6):775-80.

The Norwegian twin registry from a public health perspective: a research update. Nilsen TS, Knudsen GP, Gervin K, Brandt I, Røysamb E, Tambs K, Orstavik R, Lyle R, Reichborn-Kjennerud T, Magnus P, Harris JR. Twin Res Hum Genet. 2013 Feb;16(1):285-95.

The Norwegian Institute of Public Health twin program of research: An update. Harris JR, Magnus P, Tambs K. Twin Res Hum Genet. 2006 Dec;9(6):858-64.

Norwegian Twin Registers and Norwegian twin studies - an overview. Bergem AL. Twin Res. 2002 Oct;5(5):407-14. Review.

The Norwegian Institute of Public Health Twin Panel: A description of the sample and program of research. Harris JR, Magnus P, Tambs K. Twin Res. 2002 Oct;5(5):415-23. Review.