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. 2006 Dec 20;1(1):e22. doi: 10.1371/journal.pone.0000022

Table 1. Number of twins in the countries participating in the GenomEUtwin project.

graphic file with name pone.0000022.t001.jpg

Australia Denmark Finland Netherlands Norway Sweden UK Total
N 5,856 23,807 19,633 6,222 9,066 19,516 1,098 85,198
Complete pairs 2,728 9,456 8,842 2,681 3,995 8,927 422 37,051
Mean age 31.8 31.1 26.9 25.7 24.7 28.6 32.4 28.5
MZM 411 1,319 1,243 423 639 1,633 – 5,668
DZM 269 1,642 2,672 295 544 2,523 – 7,945
MZF 849 1,727 1,598 843 863 1,965 163 8,008
DZF 529 1,860 2,737 463 741 2,806 259 9,395
DOS 670 2,908 592 657 1,208 – – 6,035

Note: MZM, monozygotic male twin pairs; DZM, dizygotic male twin pairs; MZF, monozygotic female twin pairs; DZF, dizygotic female twin pairs; DOS, dizygotic opposite-sex twin pairs (male-female pairs). No data on opposite-sex twins were available in Sweden and no data on male or opposite-sex twins were available in the UK.