TABLE 3.

Hierarchical multiple regression analysis on depressive symptoms.

Variable	β	SE	t	R2	ΔR2	F(df)	VIF
Step 1 constant		4.54	5.93∗∗∗	0.24	0.24	22.53∗∗∗ (8, 577)
Health status
Fair	0.10	2.66	1.02				7.80
Good	–0.10	2.65	–0.71				16.29
Very good	–0.35	2.67	−2.22∗				18.94
Excellent	–0.29	2.77	−2.43∗				10.96
Physical functioning
Limited a little	–0.21	1.22	–2.83∗∗				4.18
Not limited at all	–0.31	1.30	–4.00∗∗∗				4.85
Age	–0.10	0.05	–2.61∗∗				1.08
Gender	0.07	0.68	1.89				1.06
Step 2 constant		4.39	14.69∗∗∗	0.50	0.26	47.43∗∗∗ (12, 573)
Exercise (calories/week)	0.01	0.02	0.37				1.38
Exercise-induced mood	–0.23	0.03	–6.03∗∗∗				1.62
Exercise self-efficacy	–0.07	0.01	−2.09∗				1.42
Social support	–0.42	0.06	–13.26∗∗∗				1.17
Step 3 constant		12.46	8.15∗∗∗	0.51	0.01	45.25∗∗∗ (13, 572)
Mood × social support	0.98	0.00	3.17∗∗

VIF, variance inflation factor. ^∗p < 0.05; ^∗∗p < 0.01; ^∗∗∗p < 0.001.