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. Author manuscript; available in PMC: 2015 Dec 1.
Published in final edited form as: Pharmacotherapy. 2014 Oct 14;34(12):1230–1238. doi: 10.1002/phar.1502

Table 2.

Adjusted Predicted Probabilities of Good Clopidogrel Fill Adherence and Early Discontinuation of Clopidogrel by Low-Income Cost Subsidy Status, After Inverse Probability Weighting Estimationa

Variable Predicted
Percentage
Among LIS
Enrollees		 Predicted
Percentage
Among Non-
LIS Enrollees		 Average Treatment
Effect (95% CI)		 p
Value
Fill adherence to clopidogrel (PDC > 80%) for the 12 months after coronary stent placement (n=2967) 54.8% 47.6% 7.2% (1.9–12.5%) 0.008
Fill adherence to clopidogrel (PDC > 90%) for the 12 months after coronary stent placement (n=2967) 42.2% 35.3% 6.9% (2.0–11.8%) 0.006
Patients with drug-eluting stents: fill adherence to clopidogrel (PDC > 80%) for the 12 months after coronary stent placement (n=2174) 59.1% 51.7% 7.4% (1.1–13.6%) 0.022
Early discontinuation of clopidogrel after coronary stent placement (n=2550) 18.3% 21.0% −2.7% (−6.8–1.5%) 0.21

LIS = low-income cost subsidy; CI = confidence interval; PDC = proportion of days covered.

a

Adjusted for age, sex, 16 separate comorbidities, and whether the last index medication fill was for a 30-day or 90-day supply.