Statistical analysis
SECONDARY, FMS
The primary endpoints were change in school-day PA (light, moderate, and vigorous) and sedentary time measured by accelerometry. The secondary outcome was change in FMS percentile scores. Feasibility outcomes include stencil engagement observations to assess which stencils encouraged the most PA for boys and girls and director satisfaction and planned sustainment of the stencils. Statistical analyses were performed with the latest version of SAS, version 9.4. Due to the nature of this pilot study, the statistical focus will primarily be on confidence intervals. The level of significance for statistical analyses was 0.05 for demographic related variables and 95% confidence intervals not containing zero (CIs ∉ 0) for outcome related variables. The repeated measure linear model estimates the least square means for each time and group combination, no other covariates included. These least square means are used to determine whether changes in outcome variables were different between the intervention and control ECE centers across time. The models are used on dependent continuous variables including light PA, moderate PA, vigorous PA, MVPA, sedentary behavior, ball skill percentiles, locomotor skill percentiles, and total TGMD-3 percentiles. The linear model were used to determine whether changes in outcome variables were different between the intervention and control ECE centers. For all outcomes that used statistical models, all participants with at least baseline values were included in analyses; therefore, sample size varied based on the analysis. Directors’ satisfaction survey was presented in frequency and responses of open-ended questions were examined to identify common themes. For this pilot study, we set power to 80% and alpha = 0.05. With a sample size of 40 total participants, this study would need to observe effects sizes of at least 0.91 to obtain statistically significant results.