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Differences between European birthweight standards: impact on classification of 'small for gestational age'
K Hemming1, J L Hutton, S V Glinianaia
1Department of Statistics, University of Warwick, Coventry, UK.
Developmental Medicine and Child Neurology
|October 19, 2006
Summary
European birthweight standards vary significantly, leading to potential misclassification of small for gestational age (SGA) infants. Choosing appropriate standards is crucial for accurate clinical and research assessments.
Area of Science:
- Perinatal Medicine
- Biostatistics
- Public Health
Background:
- Accurate birthweight standards for gestational age are essential for identifying infants at risk.
- Existing European standards exhibit considerable variation, impacting clinical and research applications.
Purpose of the Study:
- To quantitatively review and compare European birthweight standards for singletons.
- To assess the impact of variations in standards on the classification of small for gestational age (SGA).
Main Methods:
- Comparative analysis of birthweight standards from 10 European regions.
- Evaluation of differences in median birthweights at term and SGA misclassification rates.
- Consideration of factors like exclusion criteria, construction methods, sex, and parity.
Main Results:
- Significant variation exists in exclusion criteria, calculation methods, and median term birthweights across European standards.
- Lighter standards, often with fewer exclusions, showed higher rates of SGA misclassification.
- Up to 20% misclassification of SGA was observed when comparing Scottish and Norwegian standards.
Conclusions:
- Country-specific birthweight standards can introduce misclassification due to differing derivation methods.
- Real differences in European birthweight standards are not definitively established.
- Selection of standards should align with specific clinical or research needs, with adjustments for sex and parity if necessary.
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