Results of segmented regression model assessing the impact of the intervention on opioid use
| Patients dispensed an opioid per 1000 persons per month | 95% CI | P value | |
| Intercept (rate in January 2015) | 131.42 | (129.39, 133.46) | <0.001 |
| Preintervention trend as change in rate per month (January 2015 to September 2017) | 0.03 | (−0.05, 0.11) | 0.48 |
| Change in level in the month of the intervention (October 2017) | 0.12 | (−2.04, 2.28) | 0.91 |
| Change in trend after the intervention (November 2017 to August 2019) | −0.51 | (−0.69, −0.34) | <0.001 |