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The creation of twin centile curves for size
Author(s) -
Ong Stephen,
Lim MehNoi,
Fitzmaurice Ann,
Campbell Doris,
Smith Anne P.,
Smith Norman
Publication year - 2002
Publication title -
bjog: an international journal of obstetrics and gynaecology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.157
H-Index - 164
eISSN - 1471-0528
pISSN - 1470-0328
DOI - 10.1111/j.1471-0528.2002.01361.x
Subject(s) - singleton , gestational age , biparietal diameter , medicine , standard deviation , ultrasound , circumference , gestation , obstetrics , linear regression , crystal twinning , statistics , mathematics , pregnancy , head circumference , geometry , genetics , microstructure , materials science , radiology , metallurgy , biology
Objective To create twin centile charts for size. Design Retrospective study. Setting Aberdeen Maternity Hospital. Methods Ultrasound measurements of abdominal circumference (AC), biparietal diameter (BPD) and femur length (FL) for 1011 twin pregnancies were extracted from a databank. The methodology is based on that described by Altman and Chitty [Br. J. Obstet. Gynaecol. 101 (1994) 29.]; only one measurement from each twin was used, polynomial regression models were fitted separately to the mean and standard deviation (SD) of the ultrasound parameter as functions of gestational age. The centiles were obtained assuming that at each gestation, the measurements had a normal distribution. Results The growth pattern of AC for twins appear to follow closely that of singletons until 32 weeks. Thereafter, there is a gradual but definite fall off in growth away from singleton standards. The pattern of growth of FL is largely similar to that of singletons. From mid to early third trimester, the BPD of twin babies was larger than that of singletons.