The Danish Twin Registry comprises information on approximately 175,000 twins from 140 birth cohorts. The register includes a wide range of survey data, including repeated measurements on same individuals. For a subset of twins, also biological samples have been collected.
Below you will find more information on the data available from each data collection wave and links to each survey. Information on zygosity has only been collected until 2000, but this information will be updated.
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Further information can be found in the background paper describing the registry: Pedersen et al.:
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The Danish Twin Registry
Overview of cohorts included in the Danish Twin Registry
(until 2000):
| Cohort | No. of twins | Males/females | No. with known zygosity |
| 1870-1910 | 26,474 | 12,938/13,536 | 20,638 |
| 1911-1930 | 12,300 | 5,897/6,403 | 9,924 |
| 1931-1952 | 34,492 | 18,759/15,553 | 29,106 |
| 1953-1967 | 21,796 | 11,399/10,384 | 20,346 |
| 1968-1982 | 20,418 | 10,415/9,733 | 17,306 |
| 1983-2000 | 32,396 | 16,237/15,713 | 24,168 |
| Total | 147,876 | 75,645/71,322 | 121,488 |
Twin survey data
Survey data and biological samples from several twin surveys are available for scientific purposes:
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Omnibus 1994/2002
Diseases and health conditions in young twins -
LSADT 1995-2007
The Longitudinal Study of Aging in Danish Twins -
MADT 1998/2008-2011
The Middle Aged Danish Twin Study -
MIDT 2008-2011
The MIddle Aged Danish Twin Study -
Geminakar 1998/2010-2012
Impact of genes and environment on insulin resistance, obesity and CVD risk factors – a longitudinal twin study.
Overview of data available at each data collection wave:
| Survey | Survey year | Participants | Males/females | Completed pairs | Participants with biological samples |
| Omnibus I | 1994 | 29,433 | 14,818/15,252 | 12,494 | N/A |
| Omnibus II | 2002 | 34,943 | 15,905/19,038 | 11,751 | N/A |
| LSADT | 1995 | 2,401 | 859/1,542 | 480 | N/A |
| 1997 | 2,172 | 773/1,399 | 487 | 689 | |
| 1999 | 2,709 | 1,144/1,565 | 583 | 2,319 | |
| 2001 | 2,448 | 1,090/1,358 | 525 | 2,185 | |
| 2003 | 1,844 | 815/1,029 | 347 | 1,734 | |
| 2005 | 1,372 | 610/762 | 236 | 1,255 | |
| 2007 | 121 | 35/86 | 44 | 121 | |
| MADT | 1998 | 4,314 | 2,198/2,116 | 1,884 | 4,202 |
| 2008-2011 | 2,400 | 1,134/1,266 | 816 | 2,337 | |
| MIDT | 2008-2011 | 10,276 | 4,784/5,492 | 3,035 | 10,054 |
| Geminakar | 1998 | 1,512 | 729/783 | 756 | 1,408 |
| 2010-2012 | 1,145 | 535/610 | 513 | 1,139 |
Overview of birth year according to survey year:
