Table 3. Mean Percentage Point Change in the Proportion of Transactions With a Coupon Among Drugs With Any Coupon Use^a.

Variable	Change in percentage point of transactions with a coupon (95% CI)	P value
Patient-cost characteristics
Mean total cost per patient per drug (per 10% increase)	0.27 (0.09 to 0.44)	.003
Mean patient copay before offset (per 10% increase)	−0.10 (−0.33 to 0.14)	.42
Drug characteristics: later-in-class-entrant drugs	4.16 (1.20 to 7.13)	.006
Drug-class characteristics
Mean prevalence of coupon use among in-class competitors (per 5-percentage-point increase)	3.23 (2.38 to 4.08)	<.001
Drug classes without generic competition	3.06 (−1.05 to 7.19)	.15
In-class mean total cost per patient per drug (per 10% increase)	0.23 (0.11 to 0.35)	<.001
In-class mean patient copay before offset (per 10% increase)	−0.65 (−0.27 to 0.14)	.54

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