Results We studied 42,463 infants who were bornin 1996 and 1997 and conceived with assisted repro-ductive technology and used as a comparison group3,389,098 infants born in the United States in 1997.Among singleton infants born at 37 weeks of gesta-tion or later, those conceived with assisted reproduc-tive technology had a risk of low birth weight thatwas 2.6 times that in the general population (95 per-cent confidence interval, 2.4 to 2.7).
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