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Letters

Obesity in Canadian children

Murray Finkelstein
CMAJ May 29, 2001 164 (11) 1563-1563-a;
Murray Finkelstein
Department of Family and Community Medicine Mount Sinai Hospital Toronto, Ont.
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Mark Tremblay and Douglas Willms have analyzed data from 3 Canadian surveys and drawn conclusions about secular trends in the relation between body mass index and age.1 Unfortunately, the samples they used are not random. In order for results to be generalized to the population at large, analyses must take sampling weights into account. The variances estimated from unweighted regression analyses underestimate the variance in the population, and more reliable variances are generally now computed using bootstrap methodology.2

These methodologic issues have important implications for the authors' findings. Although their results might provide some information about body mass index in Canadian children, there is no guarantee that they are representative of results for the country as a whole.

References

  1. 1.↵
    Tremblay MS, Willms JD. Secular trends in the body mass index of Canadian children [published erratum appears in CMAJ 2001;164(7): 970]. CMAJ 2000;163(11):1429-33.
    OpenUrlFREE Full Text
  2. 2.↵
    Statistics Canada. National population health survey 1994–95. Ottawa: Statistics Canada; 1995.
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CMAJ
Vol. 164, Issue 11
29 May 2001
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Obesity in Canadian children
Murray Finkelstein
CMAJ May 2001, 164 (11) 1563-1563-a;

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CMAJ May 2001, 164 (11) 1563-1563-a;
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