WORK SITE-BASED CANCER PREVENTION - PRIMARY RESULTS FROM THE WORKING WELL TRIAL

Objectives. This paper presents the behavioral results of the Working well Trial, the largest US work site cancer prevention and control tri al to date. Methods. The Working Well Trial used a randomized, matched : pair evaluation design, with the work site as the unit of assignment and analysis. The study was conducted in 111 work sites (n = 28 000 w orkers). The effects of the intervention were evaluated by comparing c hanges in intervention and control work sites, as measured in cross-se ctional surveys at baseline and follow-up. The 2-year intervention tar geted both individuals and the work-site environment. Results. There o ccurred a net reduction in the percentage of energy obtained from fat consumption of 0.37 percentage points (P = .033), a net increase in fi ber densities of 0.13 g/1000 kcal (P = .056), and an average increase in fruit and vegetable intake of 0.18 servings per day (P = .0001). Ch anges in tobacco use were in the desired direction but were not signif icant. Conclusions. Significant but small differences were observed fo r nutrition. Positive trends, but no significant results, were observe d in trial-wide smoking outcomes. The observed net differences were sm all :owing to the substantial secular changes in target behaviors.