Genetic Influences on Individual Differences in Exercise Behavior during Adolescence

Table 5

Proportions of variance explained by additive genetic, common environmental and unique environmental factors from the best-fitting models for exercise participation in three-age groups for boys and girls (95% confidence intervals added in parentheses).

		A	C	E
13-14 yr	Boys	.85 (.78–.90)	—	.15 (.10–.22)
	Girls	.38 (.22–.57)	.46 (.27–.61)	.16 (.12–.21)
15-16 yr	Boys	.80 (.76–.84)	—	.20 (.16–.24)
	Girls	.80 (.76–.84)	—	.20 (.16–.24)
17–19 yr	Boys	.72 (.65–.77)	—	.28 (.23–.35)
	Girls	.72 (.65–.77)	—	.28 (.23–.35)