Table 3.

Associations of BMI, Lifetime Asthma, Gender, and Age with Physical Activity and Sedentary Behavior

Outcome variable	Step	Predictor variable	B	t for within step predictors	R2 change for step	Cumulative R2	F change for step
High-intensity exercise	1	Age, y	−0.18	−1.03
		BMI*	0.16	0.89	.001	.001	.34
	2	Asthma†	−0.81	−2.83	.010	.011	5.18a
	3	Gender‡	−0.72	−3.92	.03	.039	15.35b
Low - intensity exercise	1	Age	0.27	1.42
		BMI	−0.30	−1.54	0.009	0.009	2.34
	2	Asthma	0.31	−2.26	0.01	0.019	5.42a
	3	Gender	0.20	0.31	0.00	0.019	.009
Strength/tone exercise	1	Age	0.1	0.48
		BMI	0.04	0.16	0.001	0.001	0.16
	2	Asthma	−0.03	−0.9	0.0	0.001	0.01
	3	Gender	−0.32	−1.47	0.004	0.005	2.15
#hours/day watch TV on school days	1	Age	0.12	1.01
		BMI	−0.01	−0.09	0.002	0.002	0.42
	2	Asthma	0.05	0.24	0.0	0.002	0.0
	3	Gender	0.19	1.54	0.004	0.006	2.38
# hours/day pc/video on school days	1	Age	−0.02	−0.23
		BMI	0.11	1.69	0.002	0.002	0.65
	2	Asthma	−0.09	−0.89	0.0	0.003	0.05
	3	Gender	−0.32	−4.82	0.04	0.04	23.18b

^ap < .05,

^bp < .001

^*BMI indicate body mass index categorized as underweight/normal weight and overweight/obese; underweight/normal weight is the reference category

^†Asthma indicates lifetime asthma yes/no; no is the reference category

^‡Gender; male is the reference category