. Author manuscript; available in PMC: 2008 Mar 25.

Published in final edited form as: Am J Prev Med. 2008 Mar;34(3):173–184. doi: 10.1016/j.amepre.2007.11.018

Table 6.

Body composition at 6^th grade (spring 2003) and 8^th grade (spring 2005 and spring 2006) by treatment group, Trial of Activity for Adolescent Girls (TAAG)

		Intervention mean^**	Control mean^**	Difference
		Intervention mean^**	Control mean^**	mean	95% CI
Age (years)	6^th grade^***	11.9	12.0	−0.0	−0.1, 0.2
	8^th grade—spring 2005	14.0	14.0	0.0	−0.0, 0.1
	8^th grade—spring 2006	14.0	14.0	0.0	−0.1, 0.1
Height (cm)	6^th grade	152.3	152.4	−0.1	−0.8, 0.6
	8^th grade—spring 2005	160.1	160.2	−0.1	−0.8, 0.6
	8^th grade—spring 2006	159.7	159.9	−0.2	−0.9, 0.5
Weight (kg)	6^th grade	48.6	49.1	−0.5	−2.5, 1.5
	8^th grade—spring 2005	58.4	59.1	−0.6	−1.7, 0.4
	8^th grade—spring 2006	58.4	58.2	0.2	−1.2, 1.6
BMI (kg/m²)	6^th grade	20.7	20.9	−0.2	−1.0, 0.6
	8^th grade—spring 2005	22.7	22.9	−0.2	−0.6, 0.2
	8^th grade—spring 2006	22.8	22.7	0.1	−0.4, 0.7
Triceps skinfold thickness (mm)	6^th grade	17.2	17.4	−0.2	−1.4, 1.0
	8^th grade—spring 2005	21.2	21.6	−0.3	−1.2, 0.6
	8^th grade—spring 2006	21.2	20.8	0.4	−0.5, 1.4
^* Percent body fat	6^th grade	27.8	28.1	−0.3	−1.7, 1.2
	8^th grade—spring 2005	31.5	31.8	−0.3	−1.2, 0.6
	8^th grade—spring 2006	31.5	31.3	0.2	−0.6, 1.1

Percent body fat = −23.911 + 2.283 * BMI + 1.917 * triceps – 0.057 * (BMI * triceps) – 0.492 * age –3.122 * black_race

^**

School means adjusted for race in stage 1 model. These adjusted school means are the dependent variable in Stage 2 model, with treatment group as a fixed effect and school nested within geographic location and site as random effects.

^***

6^th grade—spring 2003 (n=1721)

8^th grade—spring 2005 (n=3504)

8^th grade—spring 2006 (n=3502)

None of the differences were statistically significant (p>0.05).