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Background  North Carolina Nutrition and Physical Activity Self-Assessment for Child Care (NAP SACC) resources improve child body mass index (BMI) when the resources are introduced by nurses to child care providers, and offered with workshops and incentives. In San Francisco, public health and child care agencies partnered to adapt NAP SACC resources into an annual “Healthy Apple” quality improvement program (HAP).    Methods  This cluster randomized controlled trial pilot-tested integration of the HAP with bi-annual public health screenings by nurses. All child care centers that participated in Child Care Health Program (CCHP) screenings in San Francisco in 2011–2012 were offered routine services plus HAP in 2012–2013 (CCHP + HAP,  n  = 19) or routine services with delayed HAP in 2014–2015 (CCHP + HAP Delayed,  n  = 24). Intention-to-treat analyses (robust SE or mixed models) used 4 years of screening data from 12 to 17 CCHP + HAP and 17 to 20 CCHP + HAP Delayed centers, regarding 791 to 945 children ages 2 to 5y, annually. Year-specific, child level models tested if children in CCHP + HAP centers had greater relative odds of exposure to 3 index best practices and smaller Autumn-to-Spring changes in BMI percentile and z-score than children in CCHP + HAP Delayed centers, controlling for age, sex, and Autumn status. Multi-year, child care center level models tested if HAP support modified year-to-year changes (2013–2014 and 2014–2015 vs 2011–2012) in child care center annual mean Autumn-to-Spring BMI changes.    Results  In 2011–2012, the CCHP + HAP and CCHP + HAP Delayed centers had similar index practices (<15% of children were exposed to a physical activity curriculum, staff joining in active play, and drinking water pitchers) and annual BMI changes. In 2013–2014: 60% of children in CCHP + HAP centers were exposed to the 3 index practices vs 19% in CCHP + HAP Delayed centers; Mean (SE) child BMI percentile (−2.6 (0.9),  p  = 0.003) and z-score (−0.08 (0.03),  p  = 0.007) decreased more in CCHP + HAP vs CCHP + HAP Delayed centers. In 2014–2015, after all centers were offered HAP, the index practices and BMI changes were improved for all centers vs 2011–2012.    Conclusions  Integration of the HAP with existing public health nursing services was associated with significantly more children exposed to best practices and improvement in child BMI change. The results warrant continued integration of HAP into local public health infrastructure.    Trial registration  ISRCTN18857356 (24/04/2015) Retrospectively registered.    Electronic supplementary material  The online version of this article (doi:10.1186/s12889-017-4951-y) contains supplementary material, which is available to authorized users.

bmc public health

Healthy apple program to support child care centers to alter nutrition and physical activity practices and improve child weight: a cluster randomized trial