Do heart failure status and psychosocial variables moderate the relationship between leisure time physical activity and mortality risk among patients with a history of myocardial infarction?

Table 2 Hazard ratios (95 % confidence Intervals) in the stratified analysis comparing mortality risk related to leisure time physical activity of patients with high versus low depression and high versus low social support

	High depression^a	Low depression^a	p-value interaction term	High social support^a	Low social support^a	p-value interaction term
	HR ^b (95 % CI)	HR ^b (95 % CI)	p-value interaction term	HR ^b (95 % CI)	HR ² (95 % CI)	p-value interaction term
No LTPA: Reference category	1	1		1	1
Irregular LTPA	0.80 (0.52, 1.24)	0.63 (3.4, 1.15)	0.63	0.82 (0.47, 1.43)	0.69 (0.44, 1.09)	0.56
1–150 min	0.43 (0.25, 0.75)	0.69 (0.36, 1.32)	0.08	0.71 (0.39, 1.27)	0.40 (0.21, 0.77)	0.09
151–300 min	0.28 (0.13, 0.58)	0.45 (0.23, 0.88)	0.41	0.40 (0.20, 0.80)	0.30 (0.14, 0.62)	0.45
>300 min	0.48 (0.29, 0.81)	0.42 (0.20, 0.86)	0.82	0.38 (0.19, 0.79)	0.51 (0.30, 0.87)	0.10
p for trend	>0.01	>0.01	0.39	>0.01	>0.01	0.56

HR hazard ratio, CI confidence interval, LTPA leisure time physical activity
^aBased on a cutoff value of median depression = 7 and median social support = 5.6
^bHR adjusting for age and sex

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