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Background: Assessing gestational age by ultrasound can introduce a systematic bias due to sex differences in early growth. Methods: This cohort study included data on 1, births recorded in the Swedish Medical Birth Register. We compared rates of prematurity-related adverse outcomes in male infants born early term gestational week or late preterm gestational weekin relation to female infants, between a time period when pregnancy dating was based on the last menstrual periodand a time period when ultrasound was used for pregnancy datingin order to assess the method's influence on outcome by fetal sex.
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