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Related Experiment Videos

Modelling of reference values for size at birth.

C Lawrence1, J G Fryer, P Karlberg

  • 1Department of Mathematical Statistics and Operational Research, Exeter University, UK.

Acta Paediatrica Scandinavica. Supplement
|January 1, 1989
PubMed
Summary

This study developed new methods for creating reference standards for infant size at birth. These standards help accurately assess fetal growth and development using birthweight and birthlength data.

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Area of Science:

  • Perinatal Medicine
  • Biostatistics
  • Growth Monitoring

Background:

  • Accurate reference standards are crucial for assessing infant size at birth.
  • Previous methods may not fully capture the complex distributions of birth measurements.
  • A 'healthy' sub-population was identified for robust standard development.

Purpose of the Study:

  • To develop and apply novel statistical methods for constructing reference standards for infant size at birth.
  • To model the conditional distributions of birthweight and birthlength relative to gestational age.
  • To establish reference curves for birthweight given birthlength.

Main Methods:

  • Utilized data from the Swedish Medical Birth Registration (1977-1981).
  • Employed truncated Normal distributions and Box-Cox power transformations for modeling.

Related Experiment Videos

  • Applied spline functions and a multiplicative method to generate percentage point curves.

    • Main Results:

    • Successfully modeled conditional distributions of birthweight and birthlength.
    • Developed percentage point curves for assessing infant size at birth.
    • Demonstrated the application of these statistical methods.

    Conclusions:

    • The developed methods provide a robust framework for creating accurate reference standards for infant size at birth.
    • These standards can aid in the clinical assessment of fetal growth and development.
    • Further examples illustrate the practical utility of the statistical approach.