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Table 5 Adjusted change in annual ICS days-of-supply for lower and higher-risk asthma patients: restricted vs. unrestricted coverage

From: The impact of generic-only drug benefits on patients' use of inhaled corticosteroids in a Medicare population with asthma

  Baseline ICS Days-of-Supply (2003) Change in ICS Days-of-Supply from 2003 to 2004 Change in ICS Days-of-Supply from 2003 to 2004: Restricted vs. Unrestricted Coverage (Difference-in-difference)
  Restricted Coverage Unrestricted Coverage Restricted Coverage Unrestricted Coverage Restricted vs. Unrestricted (95% CI) p-value
Lower-risk asthma patients (n = 1,584) 181.20 197.70 -30.46 -14.90 -15.56 (-25.77, -5.34) 0.003
Higher-risk asthma patients (n = 218) 192.79 227.58 -28.97 -14.00 -14.97 (-41.38, 11.44) 0.265
  1. Notes: Each row represents a separate OLS regression model. We classified those with a high-risk asthma flag as higher-risk and those with no high-risk flag as lower-risk asthma patients (please see Table 3). We calculated mean changes in ICS days-of-supply for each coverage group by using the lincom command in Stata 8.2 and the mean levels of the covariables. The baseline ICS days-of-supply presents the unadjusted mean days-of-supply in each group in 2003.