Ross surverys are done for marketing purposes, yes, but that does not
invalidate them.  They have used lists of births supplied by the hospital,
but HIPPA will change that. They are using very sophisticated statistical
sampling techniques. 31% return is superb for a mailed survey.  Other
national studies (NHANES/Immunization) results are VERY close to the ROSS
data.  Just because we don't like their product or marketing, doesn't mean
their data is invalid.
Nancy

Nancy E. Wight MD, FAAP, IBCLC
Neonatologist, Children's Hospital & Sharp Mary Birch Hospital For Women
Medical Director, Sharp HealthCare Lactation Services
San Diego, California, USA
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