Daniela N Schulz|Stef Kremers|Corneel Vandelanotte|Mathieu J G van Adrichem|Francine Schneider|Math J. J. M. Candel|Hein de Vries
Effects of a Web-Based Tailored Multiple-Lifestyle Intervention for Adults: A Two-Year Randomized Controlled Trial Comparing Sequential and Simultaneous Delivery Modes
Maastricht University|Maastricht University|Central Queensland University|Maastricht University|Maastricht University|Maastricht University|Maastricht University
background webbased computertailored interventions multiple health behaviors significant public health impact yet randomized controlled trials tested assumption objective objective paper test effects sequential simultaneous webbased tailored intervention multiple lifestyle behaviors methods randomized controlled trial conducted 3 tailoring conditions ie sequential simultaneous control conditions netherlands 20092012 followup measurements took place 12 24 months intervention content based ichange model health risk appraisal respondents n5055 received feedback lifestyle behaviors indicated whether complied dutch guidelines physical activity vegetable consumption fruit consumption alcohol intake smoking participants sequential n1736 simultaneous n1638 conditions received tailored motivational feedback change unhealthy behaviors one time sequential time simultaneous mixed model analyses performed primary analyses regression analyses done sensitivity analyses overall risk score used outcome measure effects 5 individual lifestyle behaviors assessed process evaluation performed regarding exposure appreciation intervention results tailoring strategies associated small selfreported behavioral changes sequential condition significant effects compared control condition 12 months t1 effect size028 24 months t2 simultaneous condition effective effect size018 5 individual lifestyle behaviors changed time effects differed significantly conditions followups sequential condition significant changes smoking abstinence compared simultaneous condition t1 effect size031 t2 effect size041 sequential condition effective decreasing alcohol consumption control condition 24 months effect size027 change predicted amount exposure intervention total visiting time beta06 p01 total number visits beta11 p001 interventions appreciated well respondents without significant differences conditions conclusions although evidence found effectiveness programs simple conclusive finding could drawn intervention mode effective best kind intervention may depend behavior targeted personal preferences motivation research needed identify moderators intervention effectiveness results need interpreted view high selective dropout rates multiple comparisons modest effect sizes however large number people reached low cost behavioral change achieved 2 years trial registration nederlands trial register ntr 2168 httpwwwtrialregisternltrialregadminrctviewasptc2168 archived webcite httpwwwwebcitationorg6mbuqttyb