Table 2. Adjusted Likelihood of Manufacturers’ Coupon Use^a.

Variable	Odds ratio (95% CI)	P value
Patient-cost characteristics
Mean total cost per patient per drug (per 10% increase)	1.03 (1.01-1.04)	<.001
Mean patient copay before offset (per 10% increase)	0.98 (0.97-0.99)	.002
Drug characteristics: later-in-class-entrant single-source drugs	1.44 (1.09-1.89)	.01
Drug-class characteristics
Mean prevalence of coupon use among in-class competitors (per 5-percentage-point increase)	1.18 (1.10-1.26)	<.001
Drug classes without generic competition	1.35 (0.87-2.09)	.18
In-class mean total cost per patient per drug (per 10% increase)	1.01 (1.00-1.02)	.07
In-class mean patient copay before offset (per 10% increase)	0.97 (0.94-1.00)	.06

^a Analysis of data for October 2017 through September 2019 from IQVIA Formulary Impact Analyzer.