Biomaterial Database

Estimation of fetal weight by ultrasound measurement. I. Development of a new formula. 1982

S H Eik-Nes, and P Grøttum

A formula for the estimation of fetal weight combining real-time ultrasonic measurement of the fetal biparietal diameter (BPD) and the abdominal transverse diameter (ATD) has been developed. The computer-aided regression analysis was based on measurements of 396 unselected fetuses with birth weight range 680-5080 g. The measurements were made within 4 days of delivery. A main purpose was to construct a formula which could be used for prediction of fetal weight within the range 1000-5000 g and where special emphasis was placed on accuracy in the low and high weight groups. A stratified sample of 150 fetuses was therefore selected at random from the whole group. To obtain an optimum curve fitting between the explanatory variables and birth weight, various regressions of quadratic and cubic degree, regressions of exponential functions and power functions were made. The best fit was provided by a power function of the variables. In the second part of this study, this formula will be tested on a clinical material.

UI	MeSH Term	Description	Entries
D007231	Infant, Newborn	An infant during the first 28 days after birth.	Neonate,Newborns,Infants, Newborn,Neonates,Newborn,Newborn Infant,Newborn Infants
D011247	Pregnancy	The status during which female mammals carry their developing young (EMBRYOS or FETUSES) in utero before birth, beginning from FERTILIZATION to BIRTH.	Gestation,Pregnancies
D012044	Regression Analysis	Procedures for finding the mathematical function which best describes the relationship between a dependent variable and one or more independent variables. In linear regression (see LINEAR MODELS) the relationship is constrained to be a straight line and LEAST-SQUARES ANALYSIS is used to determine the best fit. In logistic regression (see LOGISTIC MODELS) the dependent variable is qualitative rather than continuously variable and LIKELIHOOD FUNCTIONS are used to find the best relationship. In multiple regression, the dependent variable is considered to depend on more than a single independent variable.	Regression Diagnostics,Statistical Regression,Analysis, Regression,Analyses, Regression,Diagnostics, Regression,Regression Analyses,Regression, Statistical,Regressions, Statistical,Statistical Regressions
D001724	Birth Weight	The mass or quantity of heaviness of an individual at BIRTH. It is expressed by units of pounds or kilograms.	Birthweight,Birth Weights,Birthweights,Weight, Birth,Weights, Birth
D001835	Body Weight	The mass or quantity of heaviness of an individual. It is expressed by units of pounds or kilograms.	Body Weights,Weight, Body,Weights, Body
D002508	Cephalometry	The measurement of the dimensions of the HEAD.	Craniometry
D005260	Female		Females
D005333	Fetus	The unborn young of a viviparous mammal, in the postembryonic period, after the major structures have been outlined. In humans, the unborn young from the end of the eighth week after CONCEPTION until BIRTH, as distinguished from the earlier EMBRYO, MAMMALIAN.	Fetal Structures,Fetal Tissue,Fetuses,Mummified Fetus,Retained Fetus,Fetal Structure,Fetal Tissues,Fetus, Mummified,Fetus, Retained,Structure, Fetal,Structures, Fetal,Tissue, Fetal,Tissues, Fetal
D006801	Humans	Members of the species Homo sapiens.	Homo sapiens,Man (Taxonomy),Human,Man, Modern,Modern Man
D000005	Abdomen	That portion of the body that lies between the THORAX and the PELVIS.	Abdomens