Effectiveness and Cost-effectiveness of a Web-based Tailored Multiple Behavior Change Intervention
H. de Vries1, D. Schulz1, F. Schneider1, N. Stanczyk1, E. Smit1, M. van Adrichem1, C. Vandelanotte1, S. Evers1, M. Candel1, S. Kremers1
1Maastricht University, The Netherlands; University of Rockhampton
Background: We tested two computer tailored lifestyle programs, one inviting people to change unhealthy behavior one at a time (sequentially), and the other inviting people to change all unhealthy behaviors (simultaneously). We compared the results with those from a comparison group receiving only lifestyle feedback. Methods: In a 2-year RCT, all respondents (N=5055) received feedback about their compliance with the guidelines for physical activity, vegetable and fruit consumption, alcohol intake and smoking. The experimental groups also received motivational feedback–based on the I-Change Model to change during via 4 steps. Mixed model, cost-effectiveness and cost-utility analyses were performed. Findings: After 1 year, the sequential condition was most effective (ES=0.28). After 2 years, the simultaneous condition was most effective (ES=0.18). Both interventions were cost-effective for changing lifestyles. Discussion: Nation-wide implementation of both interventions is recommended given their effectiveness and cost-effectiveness. A combination of both tailoring strategies may be most suitable for multiple behavior change.