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

Table 3 Subgroup comparisons for symptoms of depression and anxiety at baseline and 12 weeks

		Baseline mean (CI95%)	12 weeks mean (CI95%)	Changed over time		Group x time interaction^a		Cohen´s d
		Baseline mean (CI95%)	12 weeks mean (CI95%)	Mean^†	p	β (SE)	p	Cohen´s d
Anxiety
Normal	IG (82)	2.3 (1.9; 2.8)	2.2 (1.7; 2.7)	-0.17	0.500	-0.33 (0.38)	0.390	0.14
Normal	CG (66)	1.9 (1.4; 2.5)	2.1 (1.6; 2.6)	0.15	0.570	-0.33 (0.38)	0.390	0.14
Light	IG (10)	8.3 (7.9; 8.7)	8.1 (7.7; 8.5)	-0.19	0.360	-0.24 (0.32)	0.440	0.39
Light	CG (6)	8.5 (8;8.9)	8.5 (8.2; 8.8)	0.05	0.810	-0.24 (0.32)	0.440	0.39
Moderate /severe	IG (54)	14.5 (13; 15.9)	13.6 (12.3; 14.9)	-0.87	0.360	-3.03 (1.21)	0.010^#	0.50
Moderate /severe	CG (47)	12.3 (11.3; 13.3)	14.4 (13.3; 15.6)	2.1	0.004*	-3.03 (1.21)	0.010^#	0.50
Depression
Normal	IG (92)	2.7 (2; 3.3)	2.9 (2.2; 3.6)	0.22	0.390	0.33 (0.44)	0.450	0.11
Normal	CG (75)	2.7 (1.9; 3.5)	2.6 (1.9; 3.4)	-0.10	0.770	0.33 (0.44)	0.450	0.11
Light	IG (17)	11.3 (10.7; 12)	10.9 (10.2; 11.6)	-0.44	0.100	-0.83 (0.46)	0.070	0.22
Light	CG (10)	11.2 (10.5; 12)	11.7 (11; 12.3)	0.38	0.300	-0.83 (0.46)	0.070	0.22
Moderate /severe	IG (41)	15 (15; 15)	14.1 (13.7; 14.5)	-0.83	0.001*	-0.97 (0.31)	0.010^#	1.11
Moderate /severe	CG (41)	14.7 (13.9; 15.5)	14.8 (14.6; 15.1)	0.13	0.600	-0.97 (0.31)	0.010^#	1.11

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