Charts of Thai fetal biometries: 1. Methodology.
A cross-sectional study was conducted in order to construct new reference charts for Thai fetal biometries that are commonly used in obstetric ultrasound practice. We discussed and illustrated a sound appropriate study design and statistical analysis which lead to more valid results. A total of 621 normal pregnant women between 12-41 weeks of gestation and their fetuses were recruited. Each fetus was measured once at a randomly assigned gestational age specifically for the purpose of this study only. Stepwise linear regression technique was used to model the mean and its standard deviation as functions of gestational age. Goodness of fit and normality of the data were checked before the final models were chosen. Reference centiles were derived, taking into account the increasing variation as pregnancy proceeds. We demonstrated the stated technique with humerus data from the same study. Reference charts for other fetal biometries have been derived and are presented in subsequent papers.
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ABSTRACT: To construct charts offetal biometries at Sukhothai Hospital.
One hundred and fifty-one pregnant women attending the antenatal care clinic, Sukhothai Hospital were recruited and received ultrasonographic examinations every four weeks until delivery.
Biparietal diameter (BPD), head circumference (HC), abdominal circumference (AC), and femur length (FL) were collected from 34 samples in each gestational age group. When comparing the results with those from Western studies, all four fetal size parameters tended clearly to be lower When comparing the results with those from King Chulalongkorn Memorial Hospital, biparietal diameter, head circumference, and femur length tended to be lower in the gestational age group of 36-40 weeks.
The construction of charts of fetal biometries in each region may be useful for obstetric management.
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