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QUESTION: Can a worksite health promotion intervention change the physical and social environment related to the dietary and smoking behaviours of employees?
Design
Randomised (allocation not concealed), unblinded, controlled trial with 3 years of follow up (The Working Well Trial).
Setting
114 worksites in the US.
Participants
20 801 employees (68% men, 92% white) from 114 worksites. Worksites represented areas of manufacturing, communication, public service, and utilities and were matched for size, presence of a cafeteria site, type of smoking policy, company type, sex distribution, blue or white collar predominance, and baseline survey response. Randomisation occurred within matched pairs. Work site follow up was 97% and participant follow up was 88%.
Intervention
57 worksites (10 071 participants) were allocated to the nutrition and …
Footnotes
Source of funding: National Cancer Institute.
For correspondence: Dr L Biener, Center for Survey Research, University of Massachusetts, 100 Morrissey Boulevard, Boston, MA 02125, USA. Fax +1 617 287 7210.