Methodological problem with comparing increases in different measures of body weight

Walls, Helen L., Peeters, Anna, Mannan, Haider and Stevenson, Christopher 2011, Methodological problem with comparing increases in different measures of body weight, BMC research notes, vol. 4, no. 145, pp. 1-3.

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Title Methodological problem with comparing increases in different measures of body weight
Author(s) Walls, Helen L.
Peeters, Anna
Mannan, Haider
Stevenson, Christopher
Journal name BMC research notes
Volume number 4
Issue number 145
Start page 1
End page 3
Total pages 3
Publisher BioMed Central
Place of publication London, England
Publication date 2011-05-23
ISSN 1756-0500
Keyword(s) BMI
waist circumference
body weight
Summary Background A number of studies have compared proportional increases over time in waist circumference (WC) and body mass index (BMI). However this method is flawed. Here, we explain why comparisons of WC and BMI must take into account the relationship between them. We used data from two cross-sectional US surveys (NHANES 1988-94 and 2005-06), and calculated the percentage change in the average BMI and the average WC between the two surveys, comparing the results with a regression analysis of changes in WC relative to BMI.

Findings The crude percentage change in BMI (5.8%) was marginally greater than for WC (5.1%). But these percentages cannot be directly compared, as the relationship between the measures is described by a regression equation with an intercept term that does not equal zero. The coefficient of time from the regression equation will determine whether or not WC is on average larger for a given BMI at the second compared with the first time point.

Conclusion Differences in the percentage change in WC and the percentage change in BMI cannot be usefully directly compared. Comparisons of increases in the two measures must account for the relationship between them as described by the regression equation.
Language eng
Field of Research 119999 Medical and Health Sciences not elsewhere classified
Socio Economic Objective 970111 Expanding Knowledge in the Medical and Health Sciences
HERDC Research category C1.1 Refereed article in a scholarly journal
Copyright notice ©2011, Walls et al.
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Document type: Journal Article
Collection: School of Health and Social Development
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