• Vaccine · Dec 2013

    Review

    A systematic review of validated methods to capture stillbirth and spontaneous abortion using administrative or claims data.

    • Frances E Likis, Nila A Sathe, Ryan Carnahan, and Melissa L McPheeters.
    • Vanderbilt Evidence-based Practice Center, Vanderbilt University Medical Center, Suite 600, 2525 West End Avenue, Nashville, TN, 37203-1738, USA; Department of Medicine, Vanderbilt University Medical Center, Suite 600, 2525 West End Avenue, Nashville, TN, 37203-1738, USA. Electronic address: frances.likis@vanderbilt.edu.
    • Vaccine. 2013 Dec 30;31 Suppl 10:K74-82.

    PurposeTo identify and assess diagnosis, procedure and pharmacy dispensing codes used to identify stillbirths and spontaneous abortion in administrative and claims databases from the United States or Canada.MethodsWe searched the MEDLINE database from 1991 to September 2012 using controlled vocabulary and key terms related to stillbirth or spontaneous abortion. We also searched the reference lists of included studies. Two investigators independently assessed the full text of studies against pre-determined inclusion criteria. Two reviewers independently extracted data regarding participant and algorithm characteristics and assessed each study's methodological rigor using a pre-defined approach.ResultsTen publications addressing stillbirth and four addressing spontaneous abortion met our inclusion criteria. The International Classification of Diseases, Ninth Revision (ICD-9) codes most commonly used in algorithms for stillbirth were those for intrauterine death (656.4) and stillborn outcomes of delivery (V27.1, V27.3-V27.4, and V27.6-V27.7). Papers identifying spontaneous abortion used codes for missed abortion and spontaneous abortion: 632, 634.x, as well as V27.0-V27.7. Only two studies identifying stillbirth reported validation of algorithms. The overall positive predictive value of the algorithms was high (99%-100%), and one study reported an algorithm with 86% sensitivity. However, the predictive value of individual codes was not assessed and study populations were limited to specific geographic areas.ConclusionsAdditional validation studies with a nationally representative sample are needed to confirm the optimal algorithm to identify stillbirths or spontaneous abortion in administrative and claims databases.'Copyright © 2013 Elsevier Ltd. All rights reserved.

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