title: Computer-delivered interventions for health promotion and behavioral risk reduction: a meta-analysis of 75 randomized controlled trials, 1988-2007.
abstract: OBJECTIVE
  The use of computers to promote healthy behavior is increasing. To evaluate the efficacy of these computer-delivered interventions, we conducted a meta-analysis of the published literature.
  
  
  METHODS
  Studies examining health domains related to the leading health indicators outlined in Healthy People 2010 were selected. Data from 75 randomized controlled trials, published between 1988 and 2007, with 35,685 participants and 82 separate interventions were included. All studies were coded independently by two raters for study and participant characteristics, design and methodology, and intervention content. We calculated weighted mean effect sizes for theoretically-meaningful psychosocial and behavioral outcomes; moderator analyses determined the relation between study characteristics and the magnitude of effect sizes for heterogeneous outcomes.
  
  
  RESULTS
  Compared with controls, participants who received a computer-delivered intervention improved several hypothesized antecedents of health behavior (knowledge, attitudes, intentions); intervention recipients also improved health behaviors (nutrition, tobacco use, substance use, safer sexual behavior, binge/purge behaviors) and general health maintenance. Several sample, study and intervention characteristics moderated the psychosocial and behavioral outcomes.
  
  
  CONCLUSIONS
  Computer-delivered interventions can lead to improved behavioral health outcomes at first post-intervention assessment. Interventions evaluating outcomes at extended assessment periods are needed to evaluate the longer-term efficacy of computer-delivered interventions.
authors.affiliation: Center for Health, Intervention, and Prevention, 2006 Hillside Road, Unit 1248, University of Connecticut, Storrs, Connecticut, 06269-1248, USA. david.portnoy@uconn.edu
authors.forename: David B
authors.initials: DB
authors.lastname: Portnoy
authors.forename: Lori A J
authors.initials: LA
authors.lastname: Scott-Sheldon
authors.forename: Blair T
authors.initials: BT
authors.lastname: Johnson
authors.forename: Michael P
authors.initials: MP
authors.lastname: Carey
mesh_terms: D003201:Computers; D015438:Health Behavior; D006266:Health Education; D006293:Health Promotion; D006801:Humans; D016032:Randomized Controlled Trials as Topic; D040242:Risk Reduction Behavior