Table 2.

Changes in BMI, BMI z-score and Categories From Baseline to 12 Weeks, by Intervention Assignment (N=707)

BMI outcomes	Baseline	12 week follow up	Adjusted mean change	p-value	Adjusted difference	p-value
	Adjusted mean (SE)		β (95% CI)
BMI z-score, unitsb
3 days/week program	0.51 (0.14)	0.29 (0.14)	−0.22 (−0.31, −0.14)	<0.01	−0.17 (−0.27, −0.07)	<0.01
2 days/week program	0.41 (0.09)	0.40 (0.09)	−0.01 (−0.07, 0.05)	0.81	0.04 (−0.04, 0.13)	0.33
Control	0.44 (0.08)	0.39 (0.08)	−0.05 (−0.11, 0.01))	0.10	ref	ref
	Baseline	12 week follow up	Adjusted odds of being at a lower category at follow up	p-value	Multiplicative difference in ORs	p-value
BMI categoryb	%		OR (95% CI)
3 days/week program
<5th percentile	2.7	3.3
5th to <85th percentile	62.9	68.9
85th to <95th percentile	18.5	15.9	1.35 (1.12, 1.62)	<0.01	1.36 (1.09, 1.69)	<0.01
95th to < Severe obesity	11.9	8.6
≥Severe obesity	4.0	3.3
2 days/week program
<5th percentile	3.3	3.7
5th to <85th percentile	65.7	66.4
85th to <95th percentile	14.6	12.8	1.03 (0.93, 1.15)	0.55	1.04 (0.89, 1.22)	0.61
95th to <Severe obesity	11.0	11.3
≥Severe obesity	5.5	5.8
Control
<5th percentile	3.2	2.8
5th to <85th percentile	66.7	66.0
85th to <95th percentile	13.8	17.4	0.99 (0.88, 1.11)	0.89	ref	ref
95th to <Severe obesity	13.1	11.4
≥Severe obesity	3.2	2.5

Notes: Boldface indicates statistical significance (p<0.05).

^aAdjusted estimates from repeated measures model. Adjusted for school, age, and sex.

^bAdjusted estimates from repeated measures model. Adjusted for school.