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Estimating Drug Involvement in Fatal Overdoses With Incomplete Information.

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Accurate drug overdose statistics are crucial. Simple corrections to death certificate data significantly improve the accuracy of opioid and cocaine involvement counts, addressing understatements in uncorrected data.

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Area of Science:

  • Public Health
  • Epidemiology
  • Biostatistics

Background:

  • Death certificates often lack specific drug information for fatal overdoses.
  • Inaccurate data can lead to underestimation of drug involvement, particularly for opioids and cocaine.
  • Previous correction methods have been developed to address these data limitations.

Purpose of the Study:

  • To examine the accuracy of existing corrections for drug overdose data on death certificates.
  • To evaluate modifications to these correction methods.
  • To compare corrected mortality rates with uncorrected rates.

Main Methods:

  • Utilized a large dataset of U.S. drug overdoses (1999-2020) from the National Center for Health Statistics.
  • Employed multiple approaches to estimate opioid and cocaine involvement in unclassified overdoses.
  • Assessed prediction accuracy using mean absolute deviation and compared corrected vs. uncorrected death rates.

Main Results:

  • Regression-based corrections improved with the addition of state-fixed effects.
  • Supplementary controls for county characteristics or contributory causes did not significantly improve accuracy.
  • Naïve models, distributing unspecified deaths proportionally, provided accurate predictions, especially for county-level analyses.
  • Uncorrected data substantially understate opioid and cocaine involvement and can distort trends over time.

Conclusions:

  • Incomplete death certificate information leads to inaccurate drug-specific overdose counts.
  • Relatively simple correction methods can substantially improve the accuracy of overdose data.
  • Corrected data are essential for understanding the true scope of drug involvement in fatal overdoses.