Table 1.

Characteristics for the University of Washington Twin Registry sample by BMI status.

	BMI
Characteristics	Normal (N = 2,169)	Overweight (n = 842)	Obese (n = 460)
Demographic
Monozygotic, %	68	65	58
Age, mean years ± SD	28 ± 13	35 ± 15	38 ± 15
Female, %	65	51	66
Married or living with a partner, %	33	51	55
White, %	86	88	84
≥ High school education, %	90	90	87
Depression, %	17	20	29

BMI = body mass index; SD = standard deviation.