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Estimating Gestational Age in Late Presenters to Antenatal Care in a Resource-Limited Setting on the Thai-Myanmar Border

Author

Listed:
  • Kerryn A Moore
  • Julie A Simpson
  • Kyla H Thomas
  • Marcus J Rijken
  • Lisa J White
  • Saw Lu Moo Dwell
  • Moo Kho Paw
  • Jacher Wiladphaingern
  • Sasithon Pukrittayakamee
  • François Nosten
  • Freya J I Fowkes
  • Rose McGready

Abstract

Estimating gestational age in resource-limited settings is prone to considerable inaccuracy because crown-rump length measured by ultrasound before 14 weeks gestation, the recommended method for estimating gestational age, is often unavailable. Judgements regarding provision of appropriate obstetric and neonatal care are dependent on accurate estimation of gestational age. We determined the accuracy of the Dubowitz Gestational Age Assessment, a population-specific symphysis-fundal height formula, and ultrasound biometry performed between 16 and 40 weeks gestation in estimating gestational age using pre-existing data from antenatal clinics of the Shoklo Malaria Research Unit on the Thai-Myanmar border, where malaria is endemic. Two cohorts of women who gave birth to live singletons were analysed: 1) 250 women who attended antenatal care between July 2001 and May 2006 and had both ultrasound crown-rump length (reference) and a Dubowitz Gestational Age Assessment; 2) 975 women attending antenatal care between April 2007 and October 2010 who had ultrasound crown-rump length, symphysis-fundal measurements, and an additional study ultrasound (biparietal diameter and head circumference) randomly scheduled between 16 and 40 weeks gestation. Mean difference in estimated newborn gestational age between methods and 95% limits of agreement (LOA) were determined from linear mixed-effects models. The Dubowitz method and the symphysis-fundal height formula performed well in term newborns, but overestimated gestational age of preterms by 2.57 weeks (95% LOA: 0.49, 4.65) and 3.94 weeks (95% LOA: 2.50, 5.38), respectively. Biparietal diameter overestimated gestational age by 0.83 weeks (95% LOA: -0.93, 2.58). Head circumference underestimated gestational age by 0.39 weeks (95% LOA: -2.60, 1.82), especially if measured after 24 weeks gestation. The results of this study can be used to quantify biases associated with alternative methods for estimating gestational age in the absence of ultrasound crown-rump length to inform critical clinical judgements in this population, and as a point of reference elsewhere.

Suggested Citation

  • Kerryn A Moore & Julie A Simpson & Kyla H Thomas & Marcus J Rijken & Lisa J White & Saw Lu Moo Dwell & Moo Kho Paw & Jacher Wiladphaingern & Sasithon Pukrittayakamee & François Nosten & Freya J I Fowk, 2015. "Estimating Gestational Age in Late Presenters to Antenatal Care in a Resource-Limited Setting on the Thai-Myanmar Border," PLOS ONE, Public Library of Science, vol. 10(6), pages 1-17, June.
  • Handle: RePEc:plo:pone00:0131025
    DOI: 10.1371/journal.pone.0131025
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    References listed on IDEAS

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    1. Carstensen Bendix & Simpson Julie & Gurrin Lyle C, 2008. "Statistical Models for Assessing Agreement in Method Comparison Studies with Replicate Measurements," The International Journal of Biostatistics, De Gruyter, vol. 4(1), pages 1-28, July.
    2. Jeffrey Sachs & Pia Malaney, 2002. "The economic and social burden of malaria," Nature, Nature, vol. 415(6872), pages 680-685, February.
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