Table 3.

Descriptive potential mediators, intervention effect on mediators, effect of mediators on mcpm and mediated effect

	Baseline			Post-intervention		Mediation analyses
	Control	Intervention		Control	Intervention
	(n = 475-480)	(n = 210-215)		(n = 483-485)	(n = 210-215)
Mediators	Mean (SD)	Mean (SD)	p	Mean (SD)	Mean (SD)	Intervention effect on mediator	p	Effect mediator	p	Mediated effect	p
								on mcpm		ab (95% CI)
						a (95% CI)		b (95% CI)
Enjoyment	4.09 (0.78)	4.01 (0.76)	.21	3.97 (0.82)	3.86 (0.81)	- 0.07 (-.20; 0.06)	.30	32.78 (10.03; 55.53)	.005	- 2.31 (-6.86; 2.25)	.32
Self-efficacy	3.81 (0.77)	3.83 (0.75)	.70	3.84 (0.83)	3.73 (0.79)	- 0.15 (-.31; 0.01)	.06	42.56 (19.07; 66.06)	<.000	- 6.42 (-13.83; 0.98)	.09
Social support friends	2.92 (1.00)	2.86 (1.07)	.47	2.73 (1.00)	2.70 (0.86)	- 0.02 (-0.16; 0.13)		41.56 (21.58; 61.53)	<.000	- 0.67 (-6.74; 5.40)	.83
Social support parents	2.30 (0.78)	2.37 (0.76)	.34	2.23 (0.80)	2.19 (0.74)	- 0.03 (-16; 0.10)	.62	9.60 (-17.30; 36.50)	.49	- 0.30 (-1.69; 1.11)	.68
Social support teachers	1.67 (0.72)	1.79 (0.83)	.08	1.43 (0.57)	1.56 (0.66)	0.12 (0.02; 0.21)	.02	- .13 (-31.81; 31.57)	.99	- 0.02 (-3.75; 3.73)	.99
Environmental opportunities	4.22 (0.80)	4.26 (0.82)	.54	4.08 (0.89)	4.18 (0.89)	0.11 (-0.04; 0.26)	.15	15.53 (-5.61; 36.67)	.15	1.72 (153; 4.98)	.29

Mcpm = mean count per minute.

Baseline differences between the potential mediators were tested with independent t-test.

Significant results in bold.