Table 1.

Baseline characteristics and afterschool snack consumption of the longitudinal sample of children in 20 Boston afterschool sites with snack intake data in fall 2010 and spring 2011(N=400)^{a, b}

	Intervention (N=188)	Control (N=212)	P value
Age (years), mean (standard deviation)	7.80 (1.80)	7.60 (1.65)	0.23
Male (%)	46.2%	51.9%	0.27
Race/ethnicity (%)c
White	3.2%	11.3%	<0.01
Black/African American	23.4%	33.5%	0.03
Hispanic/Latino	35.1%	28.8%	0.20
Asian	5.3%	2.4%	0.19
Cape Verdean	1.1%	4.3%	0.67
Black Hispanic	3.7%	2.8%	0.77
Multiracial	5.9%	3.8%	0.36
Missing	22.3%	13.2%
Ounces of 100% juice consumed per snack, mean (standard deviation)	1.63 (2.00)	1.88 (1.89)	0.94
Servings of fruits & vegetables consumed per snack, mean (standard deviation)	0.07 (0.21)	0.10 (0.22)	0.28
Servings of foods with trans fats consumed per snack, mean (standard deviation)	0.19 (0.28)	0.05 (0.19)	0.25
Servings of whole grains consumed per snack, mean (standard deviation)	0.14 (0.26)	0.19 (0.31)	0.71
Calories(kcals) consumed per snack, mean (standard deviation)	157.7 (96.3)	136.2 (88.5)	0.52
Beverage calories(kcals) consumed per snack, mean (standard deviation)	58.2 (52.9)	46.4 (39.9)	0.37

^ap values are from t-tests for age and chi square Fisher’s exact test for gender and race/ethnicity.

^bBaseline consumption means, standard deviations are based on child 2-day means. Baseline p values are derived from person day data: 27 children with one day of data & 161 children with 2 days of data in intervention sites, 40 children with one day of data and 172 children with 2 days of data in control sites; tested for differences in baseline consumption with PROC MIXED to account the clustered sample (within person and within site).

^cResearchers asked parents to identify race and ethnicity using an open-ended question.