title: Validation of Web-based questionnaires regarding osteoporosis prevention in young British women.
abstract: OBJECTIVE
  The aim was to assess the content, validity and reproducibility of web-based questionnaires, for a study on osteoporosis prevention among young British women. Twenty-two questionnaires to assess knowledge, self-efficacy, physical activity, calcium intake, health beliefs and stages of change relevant to osteoporosis prevention were identified. Nine were selected and modified to compensate for cultural differences, to suit young women, for completion on the Web.
  
  
  METHODS
  Subjects were recruited by e-mail and asked to complete the web-based questionnaires. Subjects completed the questionnaires again, on paper and were asked to assess the content validity, at least seven days later.
  
  
  METHODS
  University of Glasgow, Scotland.
  
  
  METHODS
  Sixteen female students and staff aged 19-49.
  
  
  RESULTS
  The questionnaires' reproducibility, as measured by the intraclass correlation coefficient was significant at p < 0.01 and acceptable, i.e. above 0.70 for knowledge, 0.85; for self-efficacy, 0.72; for exercise stage of change, 0.79; for exercise benefits, 0.89 and for exercise barriers, 0.82. The intraclass correlation coefficient was significant at p < 0.01 for health belief, 0.43, for weight-bearing physical activity, 0.67, for calcium barriers, 0.48, for 'others around you', 0.65, for calcium stage of change, 0.50 and for calcium intake, 0.56. The intraclass correlation coefficient was not significant for calcium benefits.
  
  
  CONCLUSIONS
  Assessing content validity was valuable in ensuring questionnaires were relevant and interpreted correctly by the sample population. Nine web-based questionnaires suitable for, and validated with, young British women are now available for use as outcome measures in studies of health education to prevent osteoporosis.
authors.affiliation: Department of Public Health, University of Glasgow, Lilybank Gardens, Glasgow.
authors.forename: J
authors.initials: J
authors.lastname: Marsden
authors.forename: R B
authors.initials: RB
authors.lastname: Jones
mesh_terms: D000328:Adult; D005260:Female; D006801:Humans; D020407:Internet; D008875:Middle Aged; D010024:Osteoporosis / Q000517:prevention & control*; D015203:Reproducibility of Results; D011795:Surveys and Questionnaires / Q000592:standards*; D006113:United Kingdom