![]() ![]() ![]() ![]() The Apgar score at 1 min ( p = 0.01) and arterial cord pH ( p < 0.001) were lower in boys. Boys were significantly heavier, longer, and had greater head circumference than girls ( p < 0.001) at birth. The HC and BPD were significantly larger in boys compared to girls from 20 weeks of gestation onwards ( p < 0.001) equating to a 3-day difference at 20–24 weeks. Gender-specific fetal growth curves for biparietal diameter (BPD), head circumference (HC), abdominal circumference (AC), and femur length (FL) were derived. ResultsĪ total of 27,680 complete scans were selected from the astraia© ultrasound database representing 12,368 pregnancies. Generalized Additive Model for Location, Scale and Shape (GAMLSS) was used to align the time frames of the longitudinal fetal measurements, corresponding with the methods of the postnatal growth curves of the WHO MGRS Group. The data was selected using the following criteria: routine examinations in uncomplicated singleton pregnancies, Caucasian ethnicity, and confirmation of gestational age by a crown-rump length (CRL) measurement in the first trimester. Methodsįirst, second, and third trimester fetal ultrasound examinations were conducted between 20. Our aim was to develop gender-specific fetal growth curves in a low-risk population and to compare immediate birth outcomes. According to the WHO Multicentre Growth Reference Study Group recommendations, boys and girls have different growth trajectories after birth. ![]()
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