To the Editor: The article by Guyer et al. (May 20 issue)1 draws attention to the important role that the rate of low birth weight has in the neonatal mortality rate. The birth-weight-specific rates in Sweden have previously been compared with those in other New England states, with findings similar to those described elsewhere.2 It seems important to point out that although birth-weight-specific rates are more easily obtained, gestational age has an important role. Categories of birth weight and gestational age provide the most valid comparisons. Birth-weight-specific comparisons alone may produce erroneous interpretations.2 There is one other potentially confounding.
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