Iris Kanera

108 Chapter 5 ABSTRACT Purpose The web-based Kanker Nazorg Wijzer (Cancer Aftercare Guide) responds to the needs of cancer survivors and oncology care providers to improve the counseling related to self- management of lifestyle and psychosocial challenges. In present study, overall intervention effects, and the effects of using specific intervention components were evaluated on vegetable, fruit, whole grain bread, and fish consumption, physical activity, and smoking behavior. Methods Cancer survivors from 21 Dutch hospitals were recruited for a randomized controlled trial ( N  = 462). Intervention effects after six months were evaluated using multilevel linear regression analysis (complete cases and intention-to-treat). By conducting moderation analyses, additional effects of using the behavior-related modules were explored. The false discovery rate correction was applied to account for multiple testing. Results After six months, 409 participants completed follow up (dropout = 11.5%). Indications were found that access to the intervention may result in increases of moderate physical activity and vegetable intake.Themoderate physical activity increasewasmeaningful: 74.74minutes per week higher increase in the intervention condition. Effect sizes of moderate physical activity ( d = .25), and vegetable ( d = .37) consumption were comparable to prior effective interventions. Visiting behavior-related modules affected moderate physical activity, fruit, and fish consumption. However, after correction for multiple testing, significances expired. No significant intervention effect was found on smoking behavior due to low numbers of smokers. Conclusions Although the effectiveness was shown to a limited extend, this study provided several indications that this theory-based, comprehensive and personalized eHealth intervention provides valuable content to complement usual cancer aftercare.