Table 1. Select characteristics of twins from same-sex pairs enrolled in the University of Washington Twin Registry.

Characteristic	Monozygotic	Dizygotic
	n = 1,003	n = 386
Demographic
Age (Mean years±SD)	29±13*	33±15
Education (Mean years±SD)	14±2	14±2
Female (%)	61	63
Non-Hispanic, White (%)	84*	90
Moderate-to-Vigorous Physical Activity
Total minutes per week (Mean minutes±SD)	109±76*	99±72
60-minute cut-point (%)	79	77
150-minute cut-point (%)	30*	25

^*Indicates difference between monozygotic and dizygotic twin pairs at P<0.05; data for cut-points presented as percentage achieving that standard; SD, standard deviation.