Table 2.

Summary of mediation effects for physical activity in men

Mediator	Longitudinal mediation: Δ in mediators from baseline to 6 months predicting Δ in PA from 6 to 24 months				Contemporaneous mediation: Δ in mediators from baseline to 24 months predicting Δ in PA from baseline to 24 months
	α coefficient (SE)	β coefficient (SE)	α β	Asymmetric confidence limit	α coefficient (SE)	β coefficient (SE)	α β	Asymmetric confidence limit
Cons of exercise
Single-mediator model	−0.034 (0.061)	−0.007 (0.012)	0.000	−0.001, 0.002	−0.014 (0.065)	−0.006 (0.011)	0.000	−0.001, 0.001
Multiple-mediator model		0.007 (0.014)	−0.000	−0.002, 0.001		0.012 (0.012)	−0.000	−0.002, 0.001
Pros of exercise
Single-mediator model	0.125 (0.073)	−0.018 (0.010)	−0.002	−0.007, 0.000	0.246 (0.076)**	0.014 (0.009)	0.003	−0.001, 0.009
Multiple-mediator model		−0.032 (0.012)**	−0.004	−0.010, 0.000		0.005 (0.011)	0.001	−0.004, 0.007
Barriers efficacy
Single-mediator model	−0.112 (1.592)	0.001 (0.0004)	−0.000	−0.003, 0.003	0.136 (1.781)	0.002 (0.000)**	0.000	−0.007, 0.007
Multiple-mediator model		0.001 (0.001)	−0.000	−0.004, 0.003		0.002 (0.000)**	0.000	−0.007, 0.007
Performance efficacy
Single-mediator model	2.851 (2.207)	0.000 (0.000)	0.000	−0.001, 0.002	3.733 (2.216)	0.000 (0.000)	0.011	−0.001, 0.004
Multiple-mediator model		−0.000 (0.000)	−0.001	−0.002, 0.002		−0.000 (0.000)	−0.001	−0.004, 0.002
Cognitive processes of change
Single-mediator model	0.027 (0.052)	0.027 (0.014)*	0.001	−0.002, 0.004	0.120 (0.059)*	0.023 (0.012)	0.003	−0.000, 0.007
Multiple-mediator model		0.050 (0.018)**	0.001	−0.004, 0.007		−0.009 (0.016)	−0.001	−0.006, 0.003
Behavioral processes of change
Single-mediator model	0.148 (0.057)**	0.002 (0.013)	0.000	−0.004, 0.004	0.196 (0.063)**	0.035 (0.011)**	0.007	0.002, 0.014a
Multiple-mediator model		−0.006 (0.017)	−0.001	−0.006, 0.004		0.030 (0.015)	0.006	0.000, 0.014a

^aSignificant mediator

^*p<0.05

^**p<0.01