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OBJECTIVE:To examine the association of intrapair birth weight discordance with fetal and neonatal mortality.METHODS:We used the United States (1995-1997) Matched Multiple Birth File (n = 297,155).RESULTS:Among twin live births and stillborn fetuses, 29.9% had less than 5% birth weight discordance, 24.2% had 5-9%, 29.6% had 10-19%, 11.1% had 20-29%, 3.4% had 30-39%, and 1.8% had 40% or more. The stillborn...
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