Genetic Influences on Individual Differences in Exercise Behavior during Adolescence

Table 3

Twin correlations for exercise participation in each age group (95% confidence intervals added in parentheses).

	13-14 yr	15-16 yr	17–19 yr
MZM	.85 (.79–.90)	.76 (.67–.82)	.73 (.60–.82)
DZM	.23 (.01–.42)	.48 (.32–.62)	.48 (.27–.65)
MZF	.83 (.78–.88)	.83 (.77–.87)	.71 (.63–.78)
DZF	.67 (.56–.75)	.52 (.39–.63)	.34 (.15–.50)
DOS	.32 (.21–.42)	.36 (.25–.47)	.29 (.12–.44)