Results
Of 197 services (101 in the intervention group and 96 in the control group), 182 (92%; 90 in the intervention group and 92 in the control group) completed the 12-month follow-up. Of the 101 services in the intervention group, 48 (48%) achieved accreditation within 12 months. Intention-to-treat analyses showed no significant effects for guideline adherence or children's activity levels. However, the services in the intervention group demonstrated greater staff physical activity-promoting behaviors during before-school care (odds ratio [OR], 1.72; 95% CI, 1.27-2.33) and greater availability of physical activity equipment during before- (OR, 1.21; 95% CI, 1.00-1.46) and after-school care (OR, 1.16; 95% CI, 1.04-1.30). In per-protocol analyses, accredited services were more likely than controls to meet all guidelines (OR, 7.35; 95% CI, 1.39-38.86), with improved after-school screen time adherence (OR, 5.63; 95% CI, 1.16-27.22). In per-protocol analyses, accredited services showed greater staff physical activity-enabling behaviors (OR, 3.00; 95% CI, 2.10-4.28), and children engaged in more physical activity during before-school care (incidence rate ratio, 1.23; 95% CI, 1.05-1.43) compared with controls.
Conclusions and relevance: This randomized clinical trial found few population-level changes in intention-to-treat analyses. However, services achieving accreditation demonstrated consistent improvements in guideline adherence, staff behaviors relating to physical activity, and children's physical activity. The intervention was effective when implemented, but limited uptake constrained population-level impact. The accreditation model is viable for practice improvement, but policy- or system-level strategies may be needed to drive widespread adoption.