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Date: | Fri, 5 Aug 2005 20:34:41 -0400 |
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One thing that is difficult about studies doing logistic regressions is
that when two variables that they include in the analysis are highly
linked, then one or both can end up getting kicked out of the model as not
being "independent" variables, though it may be that both are
significant. So if babies who are breastfed also tend to have good
prenatal care, then if prenatal care is significant, then breastfeeding
may get kicked out of the model. Breastfeeding may still have an
influence, but teasing that out from the influence of prenatal care may
require much larger numbers than they would have had.
(And thanks Tarah for the analysis of the Peds article -- spoken like
another
Shannon McElearney, MD, MS
Dept of Surgery
UVA
another eventual breastfeeding researcher, only from the surgery side (is
there such a thing? hopefully, by the time I'm done!)
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