HOP'N after-school project: an obesity prevention randomized controlled trial

Table 2 After-School Program Participants Adjusted Mean Differences (SE) by condition and pretest weight status.

Variable	Spring Posttest - Fall Pretest Adjusted Mean Change (SE)²						p¹
	Control Sites			HOP'N Sites
	Yr. B	Yr. 1	Yr. 2	Yr. B	Yr. 1	Yr. 2
Body Mass Index (BMI)							.17
All Participants	0.3 (0.3)	0.9 (0.4)	0.2 (0.3)	0.7 (0.3)	0.1 (0.3)	0.1 (0.3)
< 85 Percentile BMI	0.6 (0.3)	0.5 (0.4)	0.4 (0.3)	0.4 (0.4)	0.2 (0.3)	0.1 (0.3)
≥ 85 Percentile BMI	0.0 (0.4)	1.3 (0.5)	0.1 (0.4)	1.0 (0.4)	0.1 (0.4)	-0.1 (0.3)
BMI Z-Score (BMIz)							.11
All Participants	0.1 (0.1)	0.1 (0.1)	0.0 (0.1)	0.1 (0.1)	-0.1 (0.1)	-0.1 (0.1)
< 85 Percentile BMIz	0.1 (0.1)	-0.1 (0.1)	0.1 (0.1)	0.0 (0.1)	-0.1 (0.1)	-0.2 (0.1)
≥ 85 Percentile BMIz	0.0 (0.1)	0.4 (0.2)	-0.1 (0.1)	0.2 (0.1)	0.0 (0.1)	-0.1 (0.1)

Note. BMI = Body Mass Index in Kg/m². BMIz is age and gender standardized.
Yr. B = Baseline Year. Yr. 1 = Intervention year 1. Yr. 2 = Intervention year 2.
¹Mixed model ANCOVA weight status by condition by year interaction test.
²Mixed model ANCOVA means adjusted for school random effect and condition, strata, year, demographic variables and demographic variable interactions with condition, strata, and year fixed effects. Demographic variables included S.E.S., race/ethnicity, and grade for BMI and BMIz. BMI means were also adjusted for age and gender.

ISSN: 1479-5868