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. Author manuscript; available in PMC: 2016 Nov 15.
Published in final edited form as: Behav Genet. 2013 Dec 6;44(1):36–44. doi: 10.1007/s10519-013-9632-8

Table 1.

Means and standard deviations of depressive symptoms grouped by zygosity and sex

Self-reports Parent-reports
Mean SD Mean SD
MZT Female 36.82 6.40 33.04 4.69
DZT Female 37.55 6.62 33.62 5.18
MZT Male 37.70 6.77 33.72 5.75
DZT Male 37.73 6.87 34.65 5.37
OST Female 37.52 6.38 33.85 5.90
OST Male 37.23 6.69 33.54 4.97
Total 37.35 6.60 33.58 5.26

Notes: MZT: Monozygotic Twins, DZT: Dizygotic Twins, OST: Opposite-sex Twins, SD: Standard deviation