Because of our large sample size and the
hugenumberof independentvariables (=
determinants), there are considerable
odds that some variables become significant
by chance alone; however, in our
pooleddatabasewehaveconfirmedmost
of the proven determinants of overweight.
6,34 By contrast, low physical activity
and short sleep duration had no
effect. Thismay be because of the limited
precision of our questionnaires. Furthermore,
pooling data were accompanied
by coarsening of categories (eg,
physical activity was dichotomized into
yes or no). Therefore, the effect size of
some determinants may be underestimated
in our study. In addition, pubertal
status was self-reported, which may
be considered as inaccurate. Our data
were contrary to other studies in which
a low birth weight was associated with
a higher risk of childhood overweight35;
in our analysis, low birth weight was
protective against overweight (OR = 0.7
[95% CI: 0.6–0.9]). Finally, we did not
include psychological factors or neighborhood
characteristics as further
determinants of childhood overweight.
Because of our large sample size and the
hugenumberof independentvariables (=
determinants), there are considerable
odds that some variables become significant
by chance alone; however, in our
pooleddatabasewehaveconfirmedmost
of the proven determinants of overweight.
6,34 By contrast, low physical activity
and short sleep duration had no
effect. Thismay be because of the limited
precision of our questionnaires. Furthermore,
pooling data were accompanied
by coarsening of categories (eg,
physical activity was dichotomized into
yes or no). Therefore, the effect size of
some determinants may be underestimated
in our study. In addition, pubertal
status was self-reported, which may
be considered as inaccurate. Our data
were contrary to other studies in which
a low birth weight was associated with
a higher risk of childhood overweight35;
in our analysis, low birth weight was
protective against overweight (OR = 0.7
[95% CI: 0.6–0.9]). Finally, we did not
include psychological factors or neighborhood
characteristics as further
determinants of childhood overweight.
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