Non-response bias in physical activity trend estimates

<p>Abstract</p> <p>Background</p> <p>Increases in reported leisure time physical activity (PA) and obesity have been observed in several countries. One hypothesis for these apparently contradictory trends is differential bias in estimates over time. The purpose of this...

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Main Authors: Bauman Adrian (Author), Griffiths Joe (Author), Cameron Christine (Author), Craig Cora L (Author), Tudor-Locke Catrine (Author), Andersen Ross E (Author)
Format: Book
Published: BMC, 2009-11-01T00:00:00Z.
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100 1 0 |a Bauman Adrian  |e author 
700 1 0 |a Griffiths Joe  |e author 
700 1 0 |a Cameron Christine  |e author 
700 1 0 |a Craig Cora L  |e author 
700 1 0 |a Tudor-Locke Catrine  |e author 
700 1 0 |a Andersen Ross E  |e author 
245 0 0 |a Non-response bias in physical activity trend estimates 
260 |b BMC,   |c 2009-11-01T00:00:00Z. 
500 |a 10.1186/1471-2458-9-425 
500 |a 1471-2458 
520 |a <p>Abstract</p> <p>Background</p> <p>Increases in reported leisure time physical activity (PA) and obesity have been observed in several countries. One hypothesis for these apparently contradictory trends is differential bias in estimates over time. The purpose of this short report is to examine the potential impact of changes in response rates over time on the prevalence of adequate PA in Canadian adults.</p> <p>Methods</p> <p>Participants were recruited in representative national telephone surveys of PA from 1995-2007. Differences in PA prevalence estimates between participants and those hard to reach were assessed using Student's t tests adjusted for multiple comparisons.</p> <p>Results</p> <p>The number of telephone calls required to reach and speak with someone in the household increased over time, as did the percentage of selected participants who initially refused during the first interview attempt. A higher prevalence of adequate PA was observed with 5-9 attempts to reach anyone in the household in 1999-2002, but this was not significant after adjustment for multiple comparisons.</p> <p>Conclusion</p> <p>No significant impact on PA trend estimates was observed due to differential non response rates. It is important for health policy makers to understand potential biases and how these may affect secular trends in all aspects of the energy balance equation.</p> 
546 |a EN 
690 |a Public aspects of medicine 
690 |a RA1-1270 
655 7 |a article  |2 local 
786 0 |n BMC Public Health, Vol 9, Iss 1, p 425 (2009) 
787 0 |n http://www.biomedcentral.com/1471-2458/9/425 
787 0 |n https://doaj.org/toc/1471-2458 
856 4 1 |u https://doaj.org/article/9c9cd1bcc8ec4e87b72663cd606031a6  |z Connect to this object online.