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Purpose: To construct a wellness committee (WC) implementation index and determine whether this index was associated with evidence-based intervention implementation in a workplace health promotion program., Design: Secondary data analysis of the HealthLinks randomized controlled trial., Setting: Small businesses assigned to the HealthLinks plus WC study arm., Sample: Small businesses (20-200 employees, n = 23) from 6 low-wage industries in King County, Washington., Measures: Wellness committee implementation index (0%-100%) and evidence-based intervention implementation (0%-100%)., Analysis: We used descriptive and bivariate statistics to describe worksites' organizational characteristics. For the primary analyses, we used generalized estimating equations with robust standard errors to assess the association between WC implementation index and evidence-based intervention implementation over time., Results: Average WC implementation index scores were 60% at 15 months and 38% at 24 months. Evidence-based intervention scores among worksites with WCs were 27% points higher at 15 months (64% vs 37%, P < .001) and 36% points higher at 24 months (55% vs 18%, P < .001). Higher WC implementation index scores were positively associated with evidence-based intervention implementation scores over time ( P < .001)., Conclusion: Wellness committees may play an essential role in supporting evidence-based intervention implementation among small businesses. Furthermore, the degree to which these WCs are engaged and have leadership support, a set plan or goals, and multilevel participation may influence evidence-based intervention implementation and maintenance over time.

Objectives. To determine whether (1) participating in HealthLinks , and (2) adding wellness committees to HealthLinks increases worksites' evidence-based intervention (EBI) implementation. Methods. We developed HealthLinks to disseminate EBIs to small, low-wage worksites. From 2014 to 2017, we conducted a site-randomized trial in King County, Washington, with 68 small worksites (20-200 employees). We assigned worksites to 1 of 3 arms: HealthLinks , HealthLinks plus wellness committee ( HealthLinks+ ), or delayed control. At baseline, 15 months, and 24 months, we assessed worksites' EBI implementation on a 0% to 100% scale and employees' perceived support for their health behaviors. Results. Postintervention EBI scores in both intervention arms ( HealthLinks and HealthLinks+ ) were significantly higher than in the control arm at 15 months (51%, 51%, and 23%, respectively) and at 24 months (33%, 37%, and 24%, respectively; P  < .001). Employees in the intervention arms perceived greater support for their health at 15 and 24 months than did employees in control worksites. Conclusions. HealthLinks is an effective strategy for disseminating EBIs to small worksites in low-wage industries. Public Health Implications. Future research should focus on scaling up HealthLinks , improving EBI maintenance, and measuring impact of these on health behavior.