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. Author manuscript; available in PMC: 2011 Sep 1.
Published in final edited form as: Depress Anxiety. 2010 Sep;27(9):799–806. doi: 10.1002/da.20704

Table 1.

Demographic and health characteristics of depressed and non-depressed female twins

Characteristic Depressed
(n = 481)		 Not depressed
(n = 1,505)
Demographic
 Age, mean years (SD) 33.9 (14.1) 31.0 (14.7)
 Education, mean years (SD) 13.7 (2.5) 13.7 (2.2)
 White, % 89 85
 Married or cohabitating, % 54 58
 Zygosity, %
  Monozygotic 69 73
  Dizygotic 31 27
Health
 Body mass index, mean kg/m2(SD) 25.1 (5.7) 24.1 (4.8)
 Body mass index, %
  < 18.5 (underweight) 6 4
  18.5 – 24.99 (normal) 56 65
  25.0 – 29.99 (overweight) 20 19
  ≥ 30.0 (obese) 19 12