Could birthweight prediction models be improved by adding fetal subcutaneous tissue thickness?
OBJECTIVE
The aims of the study were to: (i) compare the accuracy of standard ultrasonic algorithms in the estimation of fetal weight and; (ii) test two new algorithms in order to improve the global performance of birthweight prediction by adding fetal subcutaneous tissue thickness.


METHODS
We enrolled 398 patients who were between 34 and 42 weeks' gestation. Routine ultrasonographic biometric parameters as well as subcutaneous tissue thickness ultrasound parameters were measured. Correlation matrices between ultrasound parameters, in order to evaluate the degree of multicollinearity between these parameters, were assessed to develop a stepwise multiple regression birthweight predictive model.


RESULTS
Contributions of single ultrasound measurements in predicting birthweight were examined, by fitting Log-transformed birthweight versus single ultrasound measurements. We found that the mid-thigh tissue area was able to significantly improve the performance of the birthweight prediction process when added to the other standard ultrasound measurements. We derived two new algorithms which appeared to be better at predicting birthweight. Furthermore there was a lower minimum absolute estimation error noted when compared to other reported formulae.


CONCLUSIONS
Our algorithms showed that the addition of the mid-thigh tissue evaluation in birthweight prediction was valuable in comparison to birthweight prediction models which are based on routine ultrasound parameters.
Larciprete
Giovanni
G
Department of Perinatal Medicine, Tor Vergata University, Rome, Italy. giovanni@giovannilaciprete.it
Di Pierro
Giuseppe
G
Barbati
Giulia
G
Deaibess
Therese
T
Jarvis
Sheba
S
Valensise
Herbert
H
Romanini
Maria Elisabetta
ME
Gioia
Stefano
S
Arduini
Domenico
D
D000328:Adult; D000465:Algorithms; D001724:Birth Weight / Q000502:physiology*; D003430:Cross-Sectional Studies; D005260:Female; D005865:Gestational Age; D006801:Humans; D007231:Infant, Newborn; D011237:Predictive Value of Tests; D011247:Pregnancy; D012680:Sensitivity and Specificity; D050151:Subcutaneous Fat / Q000000981:diagnostic imaging* / Q000196:embryology; D013848:Thigh / Q000000981:diagnostic imaging / Q000196:embryology; D016216:Ultrasonography, Prenatal / Q000379:methods*