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. Author manuscript; available in PMC: 2021 Apr 12.
Published in final edited form as: Twin Res Hum Genet. 2019 Sep 23;22(6):499–507. doi: 10.1017/thg.2019.72

Fig. 1.

Fig. 1.

Basic description of the zygosity by year of birth for twin pairs in the Danish Twin Registry. Note: MZ = monozygotic, ssDZ = same-sex dizygotic, osDZ = opposite-sex dizygotic, UZ = unknown zygosity.