Customised antenatal growth charts

Gardosi, Jason; Chang, Allan; Kalyan, B.; Sahota, Daljit Singh; Symonds, E. M.

doi:10.1016/0140-6736(92)91342-6

Cited by 784 publications

(616 citation statements)

References 18 publications

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“…Birth weight was expressed as percentiles and z scores from Gardosi's intrauterine growth curves corrected for gender and gestational age. 28 Patent ductus arteriosus was diagnosed by clinical signs and echocardiographic findings. Neonatal infections were defined by ≥1 positive blood culture for common pathogens or ≥2 positive blood cultures for coagulasenegative staphylococci.…”

Section: Maternal and Newborn Characteristicsmentioning

confidence: 99%

Placental Complications and Bronchopulmonary Dysplasia: EPIPAGE-2 Cohort Study

et al. 2016

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OBJECTIVE: To investigate the relationship between placenta-mediated pregnancy complications and bronchopulmonary dysplasia (BPD) in very preterm infants.METHODS: National prospective population-based cohort study including 2697 singletons born before 32 weeks' gestation. The main outcome measure was moderate to severe BPD. Three groups of placenta-mediated pregnancy complications were compared with no placenta-mediated complications: maternal disorders only (gestational hypertension or preeclampsia), fetal disorders only (antenatal growth restriction), and both maternal and fetal disorders. RESULTS:Moderate to severe BPD rates were 8% in infants from pregnancies with maternal disorders, 15% from both maternal and fetal disorders, 23% from fetal disorders only, and 9% in the control group (P < .001). When we adjusted for gestational age, the risk of moderate to severe BPD was greater in the groups with fetal disorders only (odds ratio [OR] = 6.6; 95% confidence interval [CI], 4.1-10.7), with maternal and fetal disorders (OR = 3.7; 95% CI, 2.5-5.5), and with maternal disorders only (OR = 1.7; 95% CI, 1.0-2.7) than in the control group. When we also controlled for birth weight, the relationship remained in groups with fetal disorders only (OR = 4.2; 95% CI, 2.1-8.6) and with maternal and fetal disorders (OR = 2.1; 95% CI, 1.1-3.9).CONCLUSIONS: Placenta-mediated pregnancy complications with fetal consequences are associated with moderate to severe BPD in very preterm infants independently of gestational age and birth weight, but isolated maternal hypertensive disorders are not. Fetal growth restriction, more than birth weight, could predispose to impaired lung development.

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Section: Maternal and Newborn Characteristicsmentioning

confidence: 99%

Placental Complications and Bronchopulmonary Dysplasia: EPIPAGE-2 Cohort Study

et al. 2016

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“…1,2 Briefly, an 'optimal' birthweight for 280 days of gestation was calculated based on covariates obtained from stepwise multiple regression (maternal height, pre-pregnancy BMI, ethnicity, parity, and fetal sex), then this weight was extrapolated to the optimal weight for the gestational age at birth using Hadlock's proportionality formula. This formula expresses 'optimal' predicted birthweight at earlier gestational ages as a proportion of the predicted weight at 280 days, using the fetal growth curve of Hadlock 7 to determine the trajectory through which the 280-day weight is reached.…”

Section: Calculation Of Customised and Population Percentilesmentioning

confidence: 99%

Customised birthweight percentiles: does adjusting for maternal characteristics matter?

Hutcheon

Zhang

Cnattingius

et al. 2008

BJOG

114

110

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Objective The objective of this study was to determine whether the improved prediction of risk for perinatal mortality obtained with the use of a customised birthweight standard can also be obtained with the use of a non-customised but intrauterine-based standard.Design Population-based cohort study.Setting Sweden.Population Births in the Swedish Medical Birth Register between 1992 and 2001 (n = 782 303) with complete data on birthweight, gestational age, sex, maternal age, pre-pregnancy body mass index, height, parity, and ethnicity.Methods We calculated the relative risks (RRs) of stillbirth and early neonatal mortality among small-for-gestational-age (SGA) births as established by (1) a customised standard, (2) a population standard based on birthweights, and (3) a population standard based on a best estimate of intrauterine weights. Main outcome measures Stillbirth and early neonatal mortality (<7 days).Results The RRs of stillbirth and early neonatal mortality among SGA births as classified by the intrauterine standard were similar to those among SGA births as classified by the customised standard and much higher than those among SGA births as classified by the birthweight standard.Conclusions A non-customised but intrauterine-based standard has a similar ability to predict risk for stillbirth and early neonatal mortality as a customised birthweight standard. The process of customising population weight-for-gestational-age standards to account for maternal characteristics does little to improve prediction of perinatal mortality.

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“…Some are hospital-based, [2][3][4][5][6][7] giving rise to potential selection bias and problems of generalizability, particularly in view of the low 2,6,7 or high 4,5 socioeconomic status or high altitude 2 that characterizes some of the study hospitals; others are prescriptive rather than descriptive, ie, they are based on infants without known risk factors for impaired fetal growth and thus may not be applicable to populations with mixtures of low-and high-risk pregnancies. 8,9 Some are unisex references that fail to account for the known larger birth weight for gestational age in male versus female infants 3,4,6,10 ; others 11,12 go to the opposite extreme and provide curves that are specific for different races, parity, maternal size, and other customizing features for which available data do not permit confident inferences as to whether variations in fetal growth are physiologic or pathologic. Finally, some references are now several decades old and may no longer be pertinent to infants born in more recent years, given the increase in the size of infants born at or near term over the last several decades.…”

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confidence: 99%

A New and Improved Population-Based Canadian Reference for Birth Weight for Gestational Age

et al. 2001

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ABSTRACT. Background. Existing fetal growth references all suffer from 1 or more major methodologic problems, including errors in reported gestational age, biologically implausible birth weight for gestational age, insufficient sample sizes at low gestational age, singlehospital or other non-population-based samples, and inadequate statistical modeling techniques.Methods. We used the newly developed Canadian national linked file of singleton births and infant deaths for births between 1994 and 1996, for which gestational age is largely based on early ultrasound estimates. Assuming a normal distribution for birth weight at each gestational age, we used the expectation-maximization algorithm to exclude infants with gestational ages that were more consistent with 40-week births than with the observed gestational age. Distributions of birth weight at the corrected gestational ages were then statistically smoothed.Results. The resulting male and female curves provide smooth and biologically plausible means, standard deviations, and percentile cutoffs for defining small-and large-for-gestational-age births. Large-for-gestational age cutoffs (90th percentile) at low gestational ages are considerably lower than those of existing references, whereas small-for-gestational-age cutoffs (10th percentile) postterm are higher.

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Customised antenatal growth charts

Cited by 784 publications

References 18 publications

Placental Complications and Bronchopulmonary Dysplasia: EPIPAGE-2 Cohort Study

Placental Complications and Bronchopulmonary Dysplasia: EPIPAGE-2 Cohort Study

Customised birthweight percentiles: does adjusting for maternal characteristics matter?

A New and Improved Population-Based Canadian Reference for Birth Weight for Gestational Age

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