Are reported preterm birth rates reliable? An analysis of interhospital differences in the calculation of the weeks of gestation at delivery and preterm birth rate.


Balchin, I; Whittaker, JC; Steer, PJ; Lamont, RF; (2004) Are reported preterm birth rates reliable? An analysis of interhospital differences in the calculation of the weeks of gestation at delivery and preterm birth rate. BJOG, 111 (2). pp. 160-3. ISSN 1470-0328 DOI: https://doi.org/10.1046/j.1471-0528.2003.00026.x

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Abstract

We investigated the possibility of preterm birth misclassification as a determinant of variation in its reported rates. Using a database of 497,105 deliveries from 17 hospitals, the best estimate of gestational age made at delivery and entered into the database at that time was recalculated from the menstrual dates and mid-trimester ultrasound scan. The recalculated completed weeks of gestation at delivery was compared with that made at birth. Calculation of estimated gestational age varied between hospitals due to inconsistencies in 'rounding' and 'truncating' the weeks of gestation at delivery. This resulted in preterm birth misclassification rates of up to 10.1%.

Item Type: Article
Faculty and Department: Faculty of Epidemiology and Population Health > Dept of Non-Communicable Disease Epidemiology
Research Centre: Centre for Maternal, Reproductive and Child Health (MARCH)
PubMed ID: 14723754
Web of Science ID: 188798500011
URI: http://researchonline.lshtm.ac.uk/id/eprint/13643

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