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Related Experiment Videos

Evaluation of different weight correction methods for antenatal serum screening using data from two multi-centre

D M Kennedy1, V M Edwards, D J Worthington

  • 1Department of Clinical Chemistry, Birmingham Women's Hospital NHS Trust, Edgbaston, UK. david.kennedy@bham-womens.thenhs.com

Annals of Clinical Biochemistry
|June 22, 1999
PubMed
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Reciprocal-linear regression offers better weight correction for prenatal screening markers like alpha-fetoprotein (AFP) and human chorionic gonadotrophin (HCG). This method improves the screen positive rate (SPR) for neural tube defects (NTD) without significantly impacting Down

Area of Science:

  • Prenatal screening
  • Biochemical markers
  • Statistical modeling

Background:

  • Maternal weight influences serum marker concentrations used in prenatal screening.
  • Weight correction is crucial for accurate screening of Down's syndrome and open neural tube defects (NTD).
  • Log-linear regression is a common method for weight correction, but reciprocal-linear regression has been proposed as an alternative.

Purpose of the Study:

  • To compare the effectiveness of log-linear and reciprocal-linear regression for maternal weight correction in prenatal screening.
  • To evaluate the impact of these correction methods on the detection and screen positive rates (SPR) for Down's syndrome and NTD.
  • To determine if reciprocal-linear regression offers advantages over log-linear regression, particularly in reducing SPR variability.

Main Methods:

Related Experiment Videos

  • Comparison of log-linear and reciprocal-linear regression models for weight correction.
  • Analysis of data from two large prenatal screening programs utilizing alpha-fetoprotein (AFP) with either total human chorionic gonadotrophin (HCG) or free beta-HCG.
  • Assessment of screen positive rates (SPR) for Down's syndrome and NTD before and after applying different weight correction methods.

Main Results:

  • The reciprocal-linear method provided a closer fit to the screening data compared to log-linear regression.
  • Neither correction method significantly altered the detection rates or SPR for Down's syndrome or NTD.
  • Without weight correction, significant differences in SPR were observed for women at extreme weights.
  • Both methods reduced SPR variability for Down's syndrome, but reciprocal-linear regression was more effective for NTD screening.

Conclusions:

  • Reciprocal-linear regression offers a superior fit for maternal weight correction in prenatal screening.
  • While both methods improve SPR consistency, reciprocal-linear regression is particularly beneficial for reducing variability in NTD screening.
  • The use of reciprocal-linear regression for weight correction in prenatal screening programs is recommended, especially for NTD detection.