Arly wrote:
If 100 babies in Salt Lake City, matched to be as close in background
as possible, die from RSV
and 20 of them were breastfed
and 80 of them were formula-fed
then the unmatched difference (80-20=60)
gives us 60 who died for no other reason than that they were formula-fed
So approximately 60% of babies who die from RSV do so because they were
not breastfed


I beg to differ. To work out the effect of not breastfeeding you need to
know the BF rate of the population.
In the above example you are assuming that half the population are BF -
therefore matching 20 and 20. What if 80% of the population were formula
fed? then there would be no difference in risk.

Kirsten

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