Table 3.

Mediation of the BEAT Cancer Intervention on Physical Activity 3 Months After intervention Completion by the Change in Social Cognitive Theory Constructs From Baseline to Immediately Postintervention

	Intervention Effect on 3-Month Postintervention Activity Adjusted for Baseline		Reduction in Intervention Effect Adjusted for Construct Change Immediately Postintervention		Mediation of Intervention Effect by Construct				Percent of Intervention Effect Mediated by Variable
Variablea	τ	SE	τ′	SE	τ − τ′	SE	t statistic (τ − τ′/SE)	p-value	τ − τ′/τ × 100%
Barriers self-efficacy	12.7	4.6	10.2	4.5	2.4	1.0	2.42	.020	19.2
Task self-efficacy	12.7	4.6	12.5	4.8	0.2	0.9	0.24	.809	1.7
Barrier interference	12.7	4.6	7.7	4.4	5.0	1.6	3.09	.004	39.2
Family social support	12.7	4.6	11.9	4.8	0.8	1.3	0.65	.518	6.4
Friend social support	12.7	4.6	12.6	4.7	0.1	0.1	0.95	.350	0.5
Total social support	12.7	4.6	11.7	4.7	1.0	0.8	1.16	.252	7.7
Positive outcome expectations	12.7	4.6	12.4	4.7	0.3	0.5	0.63	.534	2.5
Positive outcome value	12.7	4.6	12.7	4.7	0.0	0.3	0.08	.937	−0.2
Negative outcome expectations	12.7	4.6	12.4	4.6	0.3	0.2	1.35	.185	2.1
Negative outcome value	12.7	4.6	12.8	4.7	−0.2	0.6	0.26	.794	−1.3
Physical activity enjoyment	12.7	4.6	12.8	5.1	−0.2	2.0	0.08	.939	−1.2
Fear of exercise	12.7	4.6	12.8	4.8	−0.2	1.1	0.15	.882	−1.2
Exercise partner	12.7	4.6	12.9	4.7	−0.2	0.4	0.43	.668	−1.4
Exercise role model	12.7	4.6	12.9	4.6	−0.2	0.2	1.56	.126	−1.9

^aResidualized change scores used for all variables with the exception of partner and role model scores, which used the direction of change (i.e., −1 = decrease, 0 = no change, +1 = increase).