Both head circumference and cephalic index were derived in 5462 cases where both biparietal diameter and occipito-frontal diameter could be measured on the same fetus. Separate regression models were fitted to estimate the mean and standard deviation at each gestational age for each parameter.Ī total of 6217 fetal head biparietal diameters and 5510 occipito-frontal diameters were measured. No exclusions were made on the grounds of small-for-date birthweight, prematurity or other events several weeks after the examination. Only the first ultrasound examination between 12 and 42 weeks of each fetus with exactly established gestational age was used for analysis. ![]() The study data were obtained from 6557 pregnant women. ![]() ![]() Obstetric clinics (outpatient and delivery units) at the University Hospital of Zurich. To create reliable reference ranges and calculate Z scores for fetal head ultrasound biometry using a large sample size which is evenly distributed from 12 to 42 weeks of pregnancy.
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