Effects of a school-based physical activity intervention on mental health indicators in a sample of Brazilian adolescents: a cluster randomized controlled trial

Table 2 Mental health indicators in intervention and control group at baseline and 12 weeks

	Group	Baseline mean (CI95%)	12 weeks mean (CI95%)	\(\:\mathbf{C}\mathbf{h}\mathbf{a}\mathbf{n}\mathbf{g}\mathbf{e}\mathbf{d}\:\) \(\:\mathbf{o}\mathbf{v}\mathbf{e}\mathbf{r}\:\mathbf{t}\mathbf{i}\mathbf{m}\mathbf{e}\)		Group x time interaction^a		Cohen´s d
	Group	Baseline mean (CI95%)	12 weeks mean (CI95%)	Mean^†	p	β (SE)	p	Cohen´s d
Sleep	IG	4.1 (3.6; 4.6)	4.5 (4; 5)	0.40	0.130	0.71 (0.38)	0.060	0.22
Sleep	CG	5 (4.3; 5.6)	4.7 (4.1; 5.2)	-0.31	0.260	0.71 (0.38)	0.060	0.22
Anxiety	IG	4.4 (3.5; 5.2)	4.8 (3.9; 5.7)	0.48	0.230	0.11 (0.61)	0.850	0.02
Anxiety	CG	4.9 (3.9; 5.9)	5.3 (4.3; 6.3)	0.37	0.410	0.11 (0.61)	0.850	0.02
Depression	IG	4 (3.3; 4.7)	4.5 (3.7; 5.2)	0.44	0.170	0.009 (0.57)	0.980	0.01
Depression	CG	4.4 (3.5; 5.4)	4.9 (4; 5)	0.44	0.340	0.009 (0.57)	0.980	0.01
Psychological well-being	IG	24 (22.8; 25.2)	24 (22.9; 25.1)	0.00	0.990	1.65 (0.75)	0.020^#	0.26
Psychological well-being	CG	24.6 (23.2; 26.1)	23 (21.8; 24.2)*	-1.65	0.003*	1.65 (0.75)	0.020^#	0.26

IG; Interventiom group; CG: Control group; CI95%: Confidence interval; β: Beta values standardized; SE: Standard error;
values adjusted for physical activity, PHV and sex;
^a: the values of intervention group is a reference
^†difference of means: Follow-up - baseline
*p < 0.05 intragroup significant difference compared to baseline value
^#p < 0.05 significative interaction group x time

ISSN: 1471-2458