title: Obtaining health information from farmers: interviews versus postal questionnaires in a New Zealand case study.
abstract: OBJECTIVE
  To compare the effectiveness of interviewer-led and postal surveys in gathering adequate health data for occupational health programmes among farmers.
  
  
  METHODS
  Two cross-sectional studies of farmers from southern New Zealand were conducted. Farms were randomly selected from the public land valuation roll and all farmers and farm workers invited to participate in the farmers' health study. First, 477 farms were invited to participate in an interviewer administered questionnaire and health check; and second, a further 432 farms were selected and invited to participate in a self-administered postal survey. Both groups completed the same questionnaire.
  
  
  RESULTS
  The response for the interviewer-led and postal surveys was 65.4 % and 51.6 % respectively. The 2 groups differed demographically, with fewer young farm workers in the postal survey, but were similar in all areas of health information collected, except that men in the interviewer-led survey were significantly more likely to have a psychological disturbance than men in the postal survey (chi ( 2 ) =5.06, df=1, p=0.024).
  
  
  CONCLUSIONS
  Despite the interviewer-led survey having a higher response rate, the postal survey produced similar health data, which is adequate for planning occupational health programmes for farmers. Extra effort should be made to recruit younger farm workers in future research.
authors.affiliation: New Zealand Environmental and Occupational Health Research Centre, Department of Preventive and Social Medicine, Otago Medical School, University of Otago, P O Box 913, Dunedin, New Zealand. kate.morgaine@stonebow.otago.ac.nz
authors.forename: Kate C
authors.initials: KC
authors.lastname: Morgaine
authors.forename: Hilda M
authors.initials: HM
authors.lastname: Firth
authors.forename: G Peter
authors.initials: GP
authors.lastname: Herbison
authors.forename: Anne-Marie
authors.initials: AM
authors.lastname: Feyer
authors.forename: David I
authors.initials: DI
authors.lastname: McBride
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D000382:Agricultural Workers' Diseases / Q000175:diagnosis / Q000453:epidemiology*; D003430:Cross-Sectional Studies; D005260:Female; D006304:Health Status; D006801:Humans; D007407:Interviews as Topic / Q000706:statistics & numerical data*; D008297:Male; D008403:Mass Screening / Q000706:statistics & numerical data*; D008875:Middle Aged; D009520:New Zealand / Q000453:epidemiology; D016272:Occupational Health; D011177:Postal Service / Q000706:statistics & numerical data*; D011795:Surveys and Questionnaires / Q000706:statistics & numerical data*