Web-based survey attracted age-biased sample with more severe illness than paper-based survey.

Author(s)
Klovning, A. Sandvik, H. & Hunskaar, S.
Year
Abstract

Objective of this study was to assess how web-based recruitment is comparable to postal surveys. In 2002, the authors invited female users of major Norwegian websites to join a women's health study on the Internet. The results of this study on the prevalence of urinary incontinence (UI) were compared with similar data collected by post in a previous epidemiological study, EPINCONT (Epidemiology of Urinary Incontinence in Nord-Trøndelag). Altogether 1,812 web respondents compared with 27,936 postal respondents from the EPINCONT study. The Internet sample was younger than the EPINCONT sample (37 vs. 48 years, P < 0.05). The proportion of women 60 years or older was 3.3% in our study and 29.0% in the EPINCONT study. Unadjusted prevalence of UI was lower in our study (20%) than in the EPINCONT study (25%), but stratified prevalence rates were higher in all individual age groups. In the Internet sample, we found less slight UI in all age groups, and more moderate (30–39 and 50–59-year age groups) and severe UI (30–39, 40–49, and 50–59-year age groups). It was concluded that the authors attracted a younger population with more severe UI than the EPINCONT study. Web-based approaches are less appropriate for studies on conditions concerning the older population than postal methods. (Author/publisher)

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Publication

Library number
20120355 ST [electronic version only]
Source

Journal of Clinical Epidemiology, Vol. 62 (2009), No. 10 (October), p. 1068-1074, 27 ref.

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