A simple regression model for estimating gestational age in later pregnancy by ultrasonography.
Three hundred and six antenatal women with confirmed LMP underwent a single real time ultrasonographic examination between 32-40 weeks of gestation. Four parameters viz. BPD, HL, FL and AP having a positive correlation with gestational age were studied. A multiple regression model for predicting gestational age by a single ultrasonographic examination was developed by forward selection method after eliminating multicollinearity; as a high degree of intercorrelation was found between FL and HL, HL was eliminated from the data. The BPD does not have a significant role in predicting gestational age in later pregnancy. The proposed regression equation with FL and AP predicts gestational age 75% of time within +/- 10 days of 95% confidence limit.
Department of Obstetrics and Gynaecology, M.L.N. Medical College, Allahabad, India.
U K
UK
Ghosh
D
D
Sharma
H
H
Iliyas
R
R
Baveja
D005260:Female; D005865:Gestational Age; D006801:Humans; D015233:Models, Statistical; D009774:Obstetrics / Q000379:methods*; D011247:Pregnancy; D011263:Pregnancy Trimester, Third; D012044:Regression Analysis; D014463:Ultrasonography / Q000379:methods*