title: Test-retest reliability of an online measure of past week alcohol consumption (the TOT-AL), and comparison with face-to-face interview.
abstract: OBJECTIVE
  This paper reports on the development of a new online measure of beverage-specific past week alcohol consumption (the TOT-AL), its test-retest reliability, and comparability with the face-to-face approach of ascertaining alcohol intake.
  
  
  METHODS
  University students participating in the reliability study completed the TOT-AL twice on the same day with at least 3 h apart. Students in the comparability study attended a face-to-face interview and completed the TOT-AL on the same day, in a randomised order, at least 3 h apart.
  
  
  RESULTS
  There was a strong correlation between the repeated measurements of the TOT-AL (r=0.99; 95% CI: 0.98, 0.99) and between the units calculated by the TOT-AL and the face-to face interview (r=0.97; 95% CI: 0.95, 0.99). A high level of agreement between measurements was also observed in a Bland-Altman analysis.
  
  
  CONCLUSIONS
  The TOT-AL is a reliable, time efficient means of ascertaining alcohol intake, equivalent to that obtained face-to-face. These findings support the use of this approach to online alcohol assessment in populations with access to the Internet.
authors.affiliation: E-health Unit, Research Department of Primary Care and Population Health, University College London, Highgate Hill, London N19 5LW, United Kingdom. z.khadjesari@pcps.ucl.ac.uk
authors.forename: Zarnie
authors.initials: Z
authors.lastname: Khadjesari
authors.forename: Elizabeth
authors.initials: E
authors.lastname: Murray
authors.forename: Eleftheria
authors.initials: E
authors.lastname: Kalaitzaki
authors.forename: Ian R
authors.initials: IR
authors.lastname: White
authors.forename: Jim
authors.initials: J
authors.lastname: McCambridge
authors.forename: Christine
authors.initials: C
authors.lastname: Godfrey
authors.forename: Paul
authors.initials: P
authors.lastname: Wallace
mesh_terms: D000293:Adolescent; D000328:Adult; D000428:Alcohol Drinking / Q000453:epidemiology*; D005260:Female; D006293:Health Promotion; D006801:Humans; D020407:Internet; D007407:Interviews as Topic; D008297:Male; D013334:Students; D013997:Time Factors; D055815:Young Adult