Two pharmacy claims can show that a person had overlapping prescribed supplies during pregnancy. The study definition matters if someone uses that evidence to infer exposure on a particular day.
What the researchers measured
Qato and Gandhi studied U.S. commercial insurance claims from 2007 to 2015. The analysis included 168,025 people with completed pregnancies and continuous insurance coverage over the specified window. During pregnancy, 10.1% had at least one opioid dispensing, 2.0% had at least one benzodiazepine dispensing, and approximately 0.5% had at least one day of overlapping days’ supply for the two drug classes.
What remains to establish in an individual file
The population percentages depend on the coverage rules and do not describe every pregnancy or establish the date of concurrent ingestion. Compare dispensing dates and days supplied with the obstetric timeline and clinical notes documenting actual use. If the question involves an effect at delivery, medication administration and specimen times are more directly relevant than an indicator covering the full pregnancy.
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