Abstract:
PURPOSE:To develop and validate an algorithm to identify preterm infants in the absence of birth certificates within Medicaid data. METHODS:Medicaid fee-for-service claims data from Florida (FL) and Texas (TX) were linked to vital statistics data for infants who were continuously eligible during the first 3 months following birth or died within that period. Prematurity was defined as less than 34 weeks gestational age. Using FL as exploratory dataset and vital statistics birth data as gold standard, we developed a logistic regression model from diagnostic and procedure codes commonly associated with preterm care, creating a prematurity score for each infant. A score cutoff was selected that maximized sensitivity while maintaining a positive predictive value (PPV) ≥ 90%. Confirmatory analyses were conducted in the TX datasets. RESULTS:The prevalence of prematurity was 5.2% (95%CI: 5.1-5.2) and 4.5% (95%CI: 4.4-4.6) in FL and TX, respectively. Using only gestational age International Classification of Disease version 9, Clinical Modification (ICD-9-CM) codes (765.20-765.27) associated with inpatient claims achieved sensitivity of 25.7% (FL) and 12.5% (TX), specificity of 99.9% (FL) and (TX), and PPV of 91.7% (FL) and 84.8% (TX). The model had excellent discriminatory validity with a c-statistic of 0.928 (95%CI: 0.925-0.931). The selected cutoff point achieved sensitivity of 52.6%, specificity of 99.8%, and PPV of 91.7% in FL. In TX, sensitivity was 46.8%, specificity was 99.9%, and PPV was 82.2%. CONCLUSION:Identification of prematurity based on gestational age ICD-9-CM codes is not sensitive. The prematurity score has superior construct validity and allows more comprehensive identification of preterm infants in the absence of birth certificates.
journal_name
Pharmacoepidemiol Drug Safjournal_title
Pharmacoepidemiology and drug safetyauthors
Eworuke E,Hampp C,Saidi A,Winterstein AGdoi
10.1002/pds.3264subject
Has Abstractpub_date
2012-06-01 00:00:00pages
640-50issue
6eissn
1053-8569issn
1099-1557journal_volume
21pub_type
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