title: The ATTEMPT cohort: a multi-national longitudinal study of predictors, patterns and consequences of smoking cessation; introduction and evaluation of internet recruitment and data collection methods.
abstract: OBJECTIVE
  The ATTEMPT study was designed to chart the natural history of smoking cessation and associated short-term health outcomes and effects on medical resource utilization among a cohort recruited across multiple countries. This paper describes the methods for recruitment and follow-up, the baseline population characteristics of the enrolled population and 1-year response rates.
  
  
  METHODS
  ATTEMPT is a multi-national prospective cohort study that used the internet for subject recruitment and online assessments every 3 months for 2.5 years.
  
  
  METHODS
  Subjects were recruited via e-mail from existing internet panels [Canada (n = 208), France (n = 201), the United Kingdom (n = 200) and the United States (n = 1400].
  
  
  METHODS
  Panel members who were aged 35-65 years, smoked at least five cigarettes per day and at initiation stated an intention to quit smoking within the next 3 months were eligible for this study.
  
  
  METHODS
  Measures included: attempts to quit, smoking status, smoking history, nicotine dependence and craving, methods used to quit smoking, reasons for quitting or failing to quit smoking, short-term health effects, health resource utilization, wellbeing, concern over weight gain, confidence in preventing weight gain, body weight and demographics. In addition, in-home assessments of weight were undertaken by field staff for a random sample of US participants.
  
  
  RESULTS
  Country-specific recruitment was completed within 17 days. The recruitment method produced a sample with characteristics broadly similar to those found in national surveys of smokers except for higher prevalence of obesity in the US and Canadian samples and higher educational level. At the end of 1 year the response rate was 52%, and there was little evidence of differential loss to follow-up by key subject characteristics. Weight reported in the survey was found to correlate highly with weight measured during in-home visits.
  
  
  CONCLUSIONS
  This paper demonstrates the feasibility of enrolling and following a diverse cohort of smokers for self-reported health and behaviour measures via the internet.
authors.affiliation: University College London, Gower Street, London, UK. robert.west@ucl.ac.uk
authors.forename: Robert
authors.initials: R
authors.lastname: West
authors.forename: Alicia
authors.initials: A
authors.lastname: Gilsenan
authors.forename: Florence
authors.initials: F
authors.lastname: Coste
authors.forename: Xiaolei
authors.initials: X
authors.lastname: Zhou
authors.forename: Remi
authors.initials: R
authors.lastname: Brouard
authors.forename: James
authors.initials: J
authors.lastname: Nonnemaker
authors.forename: Susan J
authors.initials: SJ
authors.lastname: Curry
authors.forename: Sean D
authors.initials: SD
authors.lastname: Sullivan
mesh_terms: D000328:Adult; D000368:Aged; D015331:Cohort Studies; D003362:Cost-Benefit Analysis / Q000191:economics; D003625:Data Collection / Q000379:methods; D003695:Delivery of Health Care; D005500:Follow-Up Studies; D006801:Humans; D020407:Internet; D008137:Longitudinal Studies; D008875:Middle Aged; D018579:Patient Selection; D015397:Program Evaluation; D012107:Research Design / Q000639:trends*; D016540:Smoking Cessation / Q000191:economics / Q000706:statistics & numerical data*