Table 2.

Results of multilevel model analysis on the intervention on children's recess MVPA (% of total recess)

	Model 1			Model 2
	β (SE)	95%CI	p	β (SE)	95%CI	p
Constant	14.20 (3.04)	8.24 to 20.16	<0.001**	23.88 (9.22)	5.81 to 41.94	0.009**
Baseline MVPA	0.49 (0.07)	0.36 to 0.62	<0.001**	0.37 (0.07)	0.24 to 0.49	<0.001**
Intervention	5.95 (2.97)	0.14 to 11.77	0.045*	4.5 (2.83)	-1.05 to 10.1	0.112
Sex	NE			-7.15 (1.42)	-9.94 to -4.36	<0.001**
Age	NE			-0.13 (0.62)	-1.34 to 1.09	0.841
BMI	NE			-0.55 (0.24)	-1.03 to -0.07	0.024*
Recess duration	NE			0.10 (0.07)	-0.04 to 0.24	0.147
Random
School Level	40.15 (15.44)			35.45 (13.8)
Child Level	125.17 (12)			99.10 (9.93)
Deviance	1889.766			1698.943

Abbreviations: MVPA = Moderate-to-Vigorous Physical Activity; CI = Confidence Interval; β = Regression coefficient; SE = Standard Error; NE = Not entered.

Model 1 is the crude analysis, where the intervention effect is controlled for baseline physical activity. For the intervention variable, the control group is the reference category). Model 2 is the adjusted analysis, where the effect of the intervention is corrected for sex (boy is the reference category), BMI, age and recess time. * P < 0.05; **P < 0.01.