Table 3.

Changes in Body Mass Index Z-Score from Pre-Intervention to Post-Intervention Implementation among WIC-enrolled Children, by Intervention Assignment.

Main Outcome	Unadjusted change in BMI z-score/year after intervention start*		Adjusted change in BMI z-score/year after intervention start**
BMI z-score (units)	β Value (95% CI)	P value	β Value (95% CI)	P value
All Participants (N=1,461)
Intervention Site #1	−0.02 (−0.12 to 0.07)	0.63	−0.02 (−0.11 to 0.07)	0.61
Intervention Site #2	−0.05 (−0.11 to 0.01)	0.08	−0.05 (−0.11 to 0.01)	0.09
Comparison Site	0.0 (Reference)		0.0 (Reference)
Excluding children with Asian/other race (N=1,262 participants)
Intervention Site #1	−0.03 (−0.12 to 0.07)	0.59	−0.03(−0.12 to 0.07)	0.58
Intervention Site #2	−0.08 (−0.15 to −0.02)	0.01	−0.08 (−0.14 to −0.02)	0.01
Comparison Site	0.0 (Reference)		0.0 (Reference)

Abbreviations: BMI, body mass index (calculated as weight in kilograms divided by height in meters squared); WIC, Special Supplemental Nutrition Program for Women, Infants, and Children; MA-CORD, Massachusetts Childhood Obesity Research Demonstration Study.

^*Indicates the multilevel linear regression mixed-effects model analysis with all models corrected for clustering by community and correlation within individual.

^**Additionally adjusted for child age, sex, and race/ethnicity

^±Type 3 P value evaluates equality of effects according to community as obtained from time*arm interaction term.