title: Assessment may conceal therapeutic benefit: findings from a randomized controlled trial for hazardous drinking.
abstract: BACKGROUND
  The concept that assessment of a person's health status without subsequent intervention has beneficial effects in itself has stimulated much interest in underlying psychological mechanisms, methodological implications and its public health potential. There have, however, been few experimental studies of assessment effects.
  
  
  OBJECTIVE
  To test the hypothesis that assessment in itself produces a reduction in hazardous drinking.
  
  
  METHODS
  Two conditions (group A, leaflet only and group B, leaflet and assessment but no intervention) of a four-arm randomized controlled trial with enrollment in March-April 2003.
  
  
  METHODS
  A total of 975 students (17-29 years) attending a primary health-care clinic completed a web-based Alcohol Use Disorders Identification Test (AUDIT) questionnaire. Of 599 who scored >or= 8576 consented to follow-up and were included in the full four-arm trial, of whom 293 (153 women) were assigned to groups A and B.
  
  
  METHODS
  Group A received an information leaflet at baseline. Group B received the information leaflet and 10 minutes of web-based assessment 4 weeks later.
  
  
  METHODS
  Drinking frequency, typical quantity, heavy episode frequency, personal problems and academic problems.
  
  
  RESULTS
  Baseline mean AUDIT scores were 15.0 (SD = 5.4) and 14.9 (SD = 5.0) in groups A and B, respectively. Twelve months after baseline, relative to group A, group B reported lower overall consumption (geometric means ratio 0.82, 95% CI: 0.68-0.98), fewer heavy drinking episodes (0.66, 0.47-0.91), fewer problems (0.81, 0.67-0.99) and lower AUDIT scores (beta = -1.63, -0.62 to -2.65).
  
  
  CONCLUSIONS
  Brief assessment appeared to reduce hazardous drinking. Controlled trials that rely on assessment may therefore underestimate treatment effects. Limitations include the possibility of measurement artefact due to social desirability bias.
authors.affiliation: School of Medicine and Public Health, University of Newcastle, NSW, Australia. kypri@tpg.com.au
authors.forename: Kypros
authors.initials: K
authors.lastname: Kypri
authors.forename: John D
authors.initials: JD
authors.lastname: Langley
authors.forename: John B
authors.initials: JB
authors.lastname: Saunders
authors.forename: Martine L
authors.initials: ML
authors.lastname: Cashell-Smith
mesh_terms: D000293:Adolescent; D000328:Adult; D000428:Alcohol Drinking / Q000517:prevention & control / Q000628:therapy*; D000435:Alcoholic Intoxication / Q000517:prevention & control / Q000628:therapy*; D000437:Alcoholism / Q000517:prevention & control*; D004311:Double-Blind Method; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D008297:Male; D010353:Patient Education as Topic / Q000379:methods*