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Previous Volume 347:1449-1451 October 31, 2002 Number 18 Next

	Since this article has no abstract, we have provided an extract of the first 100 words of the full text and any section headings.

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To the Editor: We agree with Hansen et al. (March 7 issue)¹ that many studies of birth defects after in vitro fertilization suffer from methodologic problems, but we believe that their study has similar limitations. The authors compared the outcomes of roughly 1000 children conceived with in vitro fertilization with those of control infants born to mothers who were significantly younger than the women who conceived with in vitro fertilization, were more likely to be parous, and were more ethnically diverse. In addition, they made no attempt to control for a history of infertility or the age of the father . . . [Full Text of this Article]

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