Ultrasound Obstet Gynecol. 1998 Jan;11(1):30-8.

How to construct 'normal ranges' for fetal variables.

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Department of Medical Statistics and Evaluation, Royal Postgraduate Medical School, Hammersmith Hospital, London, UK.

Abstract

A method to estimate reference intervals which depend on gestational age is described. The approach is based on standard statistical techniques, so implementation should be straightforward with most statistical packages. The reference limits are defined by simple formulae which may be plotted as smooth curves. The method is illustrated with analyses of three real datasets arising from different aspects of fetal monitoring.

PMID:: 9511193; [PubMed - indexed for MEDLINE]

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Research Support, Non-U.S. Gov't

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Hemoglobins

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