TABLE IV.

LINEAR REGRESSIONS OF FOUR OBJECTIVE MEASURES ON TOTAL PHYSICAL ACTIVITY EXPENDITURE AS DETERMINED FROM THE CARDIA PHYSICAL ACTIVITY HISTORY

	Sum of Skinfolds (mm) N = 5047		Caloric Intake (kcal) N = 5026		Duration on Treadmill (seconds) N = 4924		High Density Lipoprotein Cholesterol (mg/dl) N = 5020
	b	t*	b	T	b	t	b	t
Adjusted for age, race, sex, education	−0.012	−8.8	0.876	13.5	0.125	20.2	0.006	9.4
Is there a sex interaction? (t-value)	3.2		3.0		−2.8		−3.2
Sex specific regressions adjusted for age, race, education
Females	−0.012	−5.6	0.633	7.2	0.135	14.5	0.006	6.4
Males	−0.008	−5.5	1.051	10.8	0.110	12.9	0.004	5.1

^*Degrees of freedom are approximately 5,000; t = 1.96 corresponds to a two-sided significance level of 0.05; t = 2.58 corresponds to a two-sided significance level of 0.01.