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!) *********************************************** To temporarily stop your subscription: set lactnet nomail To start it again: set lactnet mail (or digest) To unsubscribe: unsubscribe lactnet All commands go to [log in to unmask] The LACTNET mailing list is powered by L-Soft's renowned LISTSERV(R) list management software together with L-Soft's LSMTP(R) mailer for lightning fast mail delivery. For more information, go to: http://www.lsoft.com/LISTSERV-powered.html