• James O Prochaska, Susan Butterworth, Colleen A Redding, Verna Burden, Nancy Perrin, Michael Leo, Marna Flaherty-Robb, and Janice M Prochaska.
• Cancer Prevention Research Center, 2 Chafee Road, University of Rhode Island, Kingston, RI 02881, USA. jop@uri.edu
• Prev Med. 2008 Mar 1; 46 (3): 226231226-31.

ObjectiveThis study was designed to compare the initial efficacy of Motivational Interviewing (MI), Online Transtheoretical Model (TTM)-tailored communications and a brief Health Risk Intervention (HRI) on four health risk factors (inactivity, BMI, stress and smoking) in a worksite sample.MethodA randomized clinical trial assigned employees to one of three recruitment strategies and one of the three treatments. The treatment protocol included an HRI session for everyone and in addition either a recommended three TTM online sessions or three MI in person or telephone sessions over 6 months. At the initial post-treatment assessment at 6 months, groups were compared on the percentage who had progressed from at risk to taking effective action on each of the four risks.ResultsCompared to the HRI only group, the MI and TTM groups had significantly more participants in the Action stage for exercise and effective stress management and significantly fewer risk behaviors at 6 months. MI and TTM group outcomes were not different.ConclusionThis was the first study to demonstrate that MI and online TTM could produce significant multiple behavior changes. Future research will examine the long-term impacts of each treatment, their cost effectiveness, effects on productivity and quality of life and process variables mediating outcomes.

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