Skip to main content
. Author manuscript; available in PMC: 2013 Mar 12.
Published in final edited form as: Psychol Med. 2011 Aug 26;42(3):521–532. doi: 10.1017/S0033291711001577

Table 4.

Tetrachoric twin pair correlations (and 95% confidence intervals) between sexual orientation and lifetime depression by zygosity.

Zygosity Sexual orientation Lifetime depression
N pairs Twin pair r MZ vs DZ N pairs Twin pair r MZ vs DZ
MZ F 1079 .53 (.33–.70) .52 (.37–.65) 910 .47 (.38–.55) .46 (.38–.53)
MZ M 633 .50 (.25–.70) 521 .43 (.28–.56)
DZ F 811 .33 (.04–.57) 696 .16 (.04–.28)
DZ M 503 .27 (−.12–.60) .35 (.17–.51) 431 .23 (.06–.39) .17 (.09–.24)
DZ OS† 866 .43 (.12–.66) 718 .15 (.02–.27)

F=female, M=male, OS =opposite-sex, MZ vs DZ = pooled MZ and DZ correlations (i.e. equated across sexes).