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Étude du biais dû aux non-répondants dans une étude épidemiologique (SAPALDIA)

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  • Jean-Christophe Luthi
  • Jean-Pierre Zellweger
  • Leticia Grize
  • Philippe Leuenberger
  • Ursula Ackermann-Liebrich

Abstract

Within the Swiss Study on Air Pollution and Lung Diseases in Adults (SAPALDIA) 16267 adults aged 18 to 60 years from 8 different locations in Switzerland were randomly selected for answering a questionnaire about respiratory health and have a lung function examination with allergy test. 9561 subjects agreed with the examination (59%) (=responders, R). In order to study the possible influence of the bias introduced by non-responders (NR), 221 subjects who refused to participate among the 966 first subjects selected in Payerne were contacted by phone. 142 accepted a home visit and answered a shortened questionnaire about the main respiratory symptoms and diseases and indicated furthermore the reasons for their refusal. Non-responders have a lower mean educational level and belong to lower social classes than responders. The frequency of respiratory symptoms and diseases, allergies and smoking is similar in R and NR except a higher frequency of wheezing during the last 12 month (R: 12.5%, NR: 5.6%, p=0.03). The level of carbon monoxide in expired air is higher in NR (17.6 ppm) that in R (11.9 ppm) (p=0.01). A similar difference exists between NR (30.7 pp) and R (24.8 ppm) among current smokers (p>0.01). The main reasons for refusal are lack of time (27.5%), lack of interest for medical study (22.6%), fear of health professionals (18.3%) or the existence of a another disease (9.9%). Furthermore, 2.8% of the subjects consider a medical study as useless and refuse principally any participation. The role of local press and media in the decision to participate seems to be important. Globally, the differences between R and NR are minimal and should not influence the validity of the results of the SAPALDIA study. Copyright Birkhäuser Verlag 1997

Suggested Citation

  • Jean-Christophe Luthi & Jean-Pierre Zellweger & Leticia Grize & Philippe Leuenberger & Ursula Ackermann-Liebrich, 1997. "Étude du biais dû aux non-répondants dans une étude épidemiologique (SAPALDIA)," International Journal of Public Health, Springer;Swiss School of Public Health (SSPH+), vol. 42(2), pages 85-94, March.
  • Handle: RePEc:spr:ijphth:v:42:y:1997:i:2:p:85-94
    DOI: 10.1007/BF01318137
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    References listed on IDEAS

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    1. Barton, J. & Bain, C. & Hennekens, C.H. & Rosner, B. & Belanger, C. & Roth, A. & Speizer, F.E., 1980. "Characteristics of respondents and non-respondents to a mailed questionnaire," American Journal of Public Health, American Public Health Association, vol. 70(8), pages 823-825.
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