Table 3.

Changes in prescription trends of hydrocodone by specialty

Total Hydrocodone Prescriptions per Month	Anesthesiology, No. Prescriptions (95% CI)	Emergency Medicine, No. Prescriptions (95% CI)	Internal Medicine, No. Prescriptions (95% CI)
Base trend in the prepolicy segment*	–120.3	–274.5	–1,245.4
	(–145.0 to –95.5)	(–333.4 to –215.6)	(–1,630.8 to –860.0)
Change in level in the postpolicy segment†	–804.9	804.5	–14,618.9
	(–1,279.9 to –329.9)	(–760.6 to 2,369.5)	(–23,710.2 to –5,527.7)
Additional change in trend in the postpolicy segment‡	56.2	–23.2	–115.2
	(28.0 to 84.5)	(–81.2 to 34.7)	(–564.7 to 334.3)

CI = confidence interval.

^*Monthly prescribing rate from October 2011 to October 2014.

^†Change in absolute number of prescriptions before and after rescheduling.

^‡Monthly prescribing rate difference before and after rescheduling until November 2017.