Table 1

Summary of size and association between the intervention and potential mediator and physical activity outcomes
Studies with positive significant effect on potential mediator (and rating of effect size) Physical activity outcomes* Studies with no significant effect on Potential mediator (and rating of effect size) Physical activity outcomes*
Cognitive/psychological
Self-efficacy towards PA 14 T [45,47,52] + [35,43,45,47,52,62] T [49,53,59] + [49,53,59]
S [43,63] (gp 1&2) S [55]
L [62] 0 [63] (gp 1&2) M [57] 0 [36,37,55,57]
NC [35] NC [36,37]
Self-perception/self-esteem 5 L [63] (gp.1) + [63] (gp.1) T [67] + [57,63] (gp 2), [67]
S [55,57]
M [56] 0 [55,56]
L [63] (gp 2)
Knowledge 9 S [42,43] + [43,59,71] S [66] + [66]
M [59,68,71] NC [37]
NC [33,34] 0 [33,34,42,68] 0 [37]
Enjoyment of PA 6 L [49,60] + [49,60] T [48] (boys) + [48] (boys), [48] (girls),
S [48] (girls), [56,67] [53,67]
M [53]
0 [56]
Intention to be physically active 5 T [65] (boys) + [46] S [67] + [36,67]
M [46] M [65] (girls)
0 [65] (boys) NC [36,38] 0 [38,65] (girls)
Outcome expectancies 5 S [47] + [36,47] T [49] + [49,57]
NC [36] S [55,57] 0 [55]
Preference for PA 4 S [57] + [46,57] S [55] 0 [54,55]
L [46] L [54]
Attitude towards PA 2 M [44] + [44] T [66] 0 [66]
Perception of safety 2 - - T [49,50] + [49]
0 [50]
PA beliefs 2 S [65] (boys and girls) 0 [65] (boys and girls) T [47] + [47]
Habit 1 NC [36] + [36] -
Attraction to PA 1 - - M [46] + [46]
Exercise behavioural capability 1 NC [35] 0 [35] - -
Awareness of PA levels 1 - - NC [36] + [36]
Perceived behavioural control 1 NC [38] 0 [38] - -
Social Environmental
Social support for PA 6 T [47,65] (boys) + [47] T [49] + [36,45,49,53]
S [53]
0 [65] (boys) M [65] (girls) 0 [65] (girls)
L [45]
NC [36]
Family support for PA 4 L [58] (mother) 0 [58] (mother) T [58] (father) + [47,57,67]
S [47,57,67] 0 [58] (father)
Peer support for PA 1 - - S [47] + [47]
Physical environmental 0 0 0

KEY:

Effect on PA: + = significant effect on physical activity (PA) outcome, 0= no significant effect on PA outcome, +/0= mixed result.

Effect size: T= trivial (≤0.2), S= small (>0.2-0.5), M= moderate (>0.5-0.8), L= large (>0.8), NC=not able to be calculated.

Brown et al.

Brown et al. BMC Public Health 2013 13:165   doi:10.1186/1471-2458-13-165

Open Data