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. Author manuscript; available in PMC: 2023 Feb 14.
Published in final edited form as: Subst Abus. 2018 May 16;39(2):239–246. doi: 10.1080/08897077.2017.1389798

Table 5.

Difference-in-differences analysis of any high dosage opioid prescription and logistic regression of the disposition of the high dosage user cohort.

State Pre Post Difference Difference-in-differences (95% confidence interval) Relative change (95% confidence interval)
Any high dosage opioid fill (>120 MED)
Oregon 0.0648***
(0.0017)		 0.0139***
(0.0009)		 −0.0509***
(0.0017)		 −0.0429*** (−0.048 to −0.0379) −66.2% (−74.1% to −58.5%)
Colorado 0.0920***
(0.0015)		 0.0840***
(0.0015)		 −0.0080***
(0.0019)
Disposition of high dosage opioid user prior to the policy
Probability of any opioid use in post Difference (95% confidence interval) Relative difference (95% confidence interval)
Oregon 0.9041***
(0.0136)		 0.1131***
(0.0829 to 0.143)		 14.3% (10.5% to 18.1%)
Colorado 0.7910***
(0.0073)
Probability of high dosage opioid use in post Difference (95% confidence interval) Relative Difference (55% Confidence Interval)
Oregon 0.3741***
(0.0231)		 −0.2032***
(−0.253 to −0.153)		 −35.2% (−43.8% to −26.5%)
Colorado 0.5774***
(0.0108)

Note. MED = morphine equivalent daily dose (mg). Estimates indicate predicted probabilities with standard errors in parentheses unless indicated otherwise. Relative change is relative percentage change in Oregon following the high dosage policy. Relative difference is relative percentage difference between Oregon and Colorado.

***

P < .05.