Individual growth curve standards for fetal head and abdominal circumferences: Effect of the type of measurement on growth prediction
- 1 January 1989
- journal article
- research article
- Published by Wiley in Journal of Clinical Ultrasound
- Vol. 17 (1) , 33-36
- https://doi.org/10.1002/jcu.1870170107
Abstract
Head and abdominal circumferences (HC, AC) can be measured directly or estimated from diameters. Accurate prediction of circumference growth after 26 weeks depends on growth model specification and the quality of the circumference measurement method used. To evaluate the effect of the method of measurement, direct and estimated HC and AC values from 20 normal fetuses, obtained between 15 and 38 weeks, were used to determine two pairs of functions for specifying HC and AC growth models. The two HC and AC data sets and pairs of model specification functions were used in various combinations to determine HC and AC growth models, to predict growth after 26 weeks, and to compare predicted values to actual measurements. Systematic and random prediction errors were determined for each combination. For HC no differences in either type of error were found. Similar results were obtained for AC with one exception, a statistically significant difference in systematic error between the directly measured circumferences — model specification based on estimated values combination and the estimated circumferences — model specification based on directly measured values combination. These results indicate that the prediction of future HC and AC growth is not significantly affected by the type of circumference measurement procedure used except in extreme cases where circumference measurements are made on parts of the body that can be easily distorted.Keywords
This publication has 13 references indexed in Scilit:
- Longitudinal studies of femur growth in normal fetusesJournal of Clinical Ultrasound, 1987
- Fetal head and abdominal circumferences: Effect of profile shape on the accuracy of ellipse equationsJournal of Clinical Ultrasound, 1987
- Fetal head and abdominal circumferences: Ellipse calculations versus planimetryJournal of Clinical Ultrasound, 1987
- Mathematical modeling of fetal growth. IV. Evaluation of trunk growth using the abdominal profile areaJournal of Clinical Ultrasound, 1987
- Mathematical modeling of fetal growth. III. Evaluation of head growth using the head profile areaJournal of Clinical Ultrasound, 1987
- Mathematical Modeling of Fetal Growth: I. Basic PrinciplesJournal of Clinical Ultrasound, 1984
- The Effect of Abdominal Profile Shape Changes on the Estimation of Fetal WeightJournal of Clinical Ultrasound, 1984
- Fetal head and abdominal circumferences: II. A critical re-evaluation of the relationship to menstrual ageJournal of Clinical Ultrasound, 1982
- The use of ultrasound in the assessment of normal fetal growth: A reviewJournal of Clinical Ultrasound, 1981
- ULTRASOUND MEASUREMENT OF THE FETAL HEAD TO ABDOMEN CIRCUMFERENCE RATIO IN THE ASSESSMENT OF GROWTH RETARDATIONBJOG: An International Journal of Obstetrics and Gynaecology, 1977