Evaluating non-medical prescription opioid demand using commodity purchase tasks: test-retest reliability and incremental validity

Justin C. Strickland, Joshua A. Lile, William W. Stoops

Research output: Contribution to journalArticlepeer-review

44 Scopus citations


Rationale: Non-medical prescription opioid use and opioid use disorder (OUD) present a significant public health concern. Identifying behavioral mechanisms underlying OUD will assist in developing improved prevention and intervention approaches. Behavioral economic demand has been extensively evaluated as a measure of reinforcer valuation for alcohol and cigarettes, whereas prescription opioids have received comparatively little attention. Objectives: Utilize a purchase task procedure to measure the incremental validity and test-retest reliability of opioid demand. Methods: Individuals reporting past year non-medical prescription opioid use were recruited using the crowdsourcing platform Amazon Mechanical Turk (mTurk). Participants completed an opioid purchase task as well as measures of cannabis demand, delay discounting, and self-reported pain. A 1-month follow-up was used to evaluate test-retest reliability. Results: More intense and inelastic opioid demand was associated with OUD and more intense cannabis demand was associated with cannabis use disorder. Multivariable models indicated that higher opioid intensity and steeper opioid delay discounting rates each significantly and uniquely predicted OUD. Increased opioid demand intensity, but not elasticity, was associated with higher self-reported pain, and no relationship was observed with perceived pain relief from opioids. Opioid demand showed acceptable-to-good test-retest reliability (e.g., intensity rxx =.75; elasticity rxx =.63). Temporal reliability was lower for cannabis demand (e.g., intensity rxx =.53; elasticity rxx =.58) and discounting rates (rxx =.42–.61). Conclusions: Opioid demand was incrementally valid and test-retest reliable as measured by purchase tasks. These findings support behavioral economic demand as a clinically useful measure of drug valuation that is sensitive to individual difference variables.

Original languageEnglish
Pages (from-to)2641-2652
Number of pages12
Issue number9
StatePublished - Sep 1 2019

Bibliographical note

Funding Information:
Funding information This research was supported by the National Science Foundation Grant 1247392, a Graduate Student Research Grant from the Psi Chi Psychology Honor Society, and Professional Development Funds from the University of Kentucky Department of Behavioral Science. These funding sources had no role in study design, data collection or analysis, or preparation and submission of the manuscript. The authors have no financial conflicts of interest in regard to this research.

Publisher Copyright:
© 2019, Springer-Verlag GmbH Germany, part of Springer Nature.


  • Behavioral economics
  • Cannabis
  • Demand
  • Discounting
  • Opioid
  • Pain
  • Purchase task
  • Reliability
  • mTurk

ASJC Scopus subject areas

  • Pharmacology


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