Identification of Prenatal Opioid Exposure Within Health Administrative Databases.

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Health administrative data offer a vital source of data on maternal prenatal opioid exposure (POE). The impact of different methods to estimate POE, especially combining maternal and newborn records, is not known.This population-based cross-sectional study included 454 746 hospital births with linked administrative data in Ontario, Canada, in 2014-2017. POE ascertainment included 3 sources: (1) prenatal opioid prescriptions, (2) maternal opioid-related hospital records, and (3) newborn hospital records with neonatal abstinence syndrome (NAS). Positive percent agreement was calculated comparing cases identified by source, and a comprehensive method was developed combining all 3 sources. We replicated common definitions of POE and NAS from existing literature and compared both number of cases ascertained and maternal socio-demographics and medical history using the comprehensive method.Using all 3 data sources, there were 9624 cases with POE (21.2 per 1000 births). Among these, positive percent agreement (95 confidence interval) was 79.0 (78.2-79.8) for prenatal opioid prescriptions, 19.0 (18.2-19.8) for maternal opioid-related hospital records, and 44.7 (43.7-45.7) for newborn NAS. Compared with other definitions, our comprehensive method identified up to 523 additional cases. Contrasting ascertainment with maternal opioid-related hospital records, newborn NAS, and prenatal opioid prescriptions respective rates of maternal low income were 57, 48, and 39; mental health hospitalization history was 33, 28, and 17; and infant discharge to social services was 8, 13, and 5.Combining prenatal opioid prescriptions and maternal and newborn opioid-related hospital codes improves identification of a broader population of mothers and infants with POE.

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