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. 2016 May;137(5):e20152493. doi: 10.1542/peds.2015-2493

TABLE 1.

Multivariable Regression Analysis of Effects of SNaX on BMI Percentile on Ninth-Grade Fitnessgram Assessment

Variable Unadjusted Means and Tests for Change Within Arma Estimated Intervention Effectb
Control Intervention Unadjusted Covariate-Adjusted
Seventh Grade Ninth Grade Seventh Grade Ninth Grade b ± SE, P b ± SE, P
Mean ± SD Mean ± SD Mean ± SD Mean ± SD)
Overall; N = 1368c 73.37 ± 27.89 71.84 ± 27.00* 73.37 ± 26.90 70.79 ± 26.71** −1.15 ± 1.02 −0.98 ± 1.01
Students obese at seventh grade; n = 415c 97.67 ± 1.30 95.16 ± 5.52** 97.92 ± 1.24 93.22 ± 10.85** −2.59 ± 0.81*** −2.33 ± 0.83***
Students overweight at seventh grade; n = 275c 91.22 ± 2.74 84.26 ± 13.94** 90.60 ± 2.94 84.76 ± 11.38** 0.90 ± 1.50 1.05 ± 1.51
Students healthy weight/underweight at seventh grade; n = 678c 50.98 ± 24.12 52.19 ± 24.50 52.05 ± 22.53 52.05 ± 23.98 −1.99 ± 2.40 −1.43 ± 2.35
a

Weighted means for all intervention and control students together, regardless of school. Inference tests based on weighted means and SEs of individual-level change in BMI percentile from seventh to ninth grade.

b

Within each row, weighted linear regression modeled ninth-grade BMI percentile on seventh-grade BMI percentile and indicators for school. Covariate-adjusted results additionally controlled for student sociodemographic characteristics (child gender, age, Latino race/ethnicity, and US-born status) and NSLP eligibility. School-level means were imputed for missing covariates (Latino, home language, US-born status, and NSLP eligibility; missing for <0.5% of the sample).

c

Among the 1368 students in the analysis, 829 attended intervention schools, and 539 attended control schools. The 415 students who were obese at seventh grade included 244 intervention and 171 control students, whereas the remaining 953 students included 585 intervention and 358 control students. Obesity at seventh grade was defined as being at or above the 95th percentile based on age (in months) and gender; overweight was defined as being between the 85th and 95th percentiles.

*

P < .05

**

P < .001

***

P < .01