FIGURE 1. Guideline-concordant pharmacotherapy for bipolar I disorder received among dual beneficiaries with a diagnosis of bipolar I disorder, 2005–2007^a.

Abbreviation: MPR = Medication possession ratio

^a The predicted line reflects the regression results for each segment. The counterfactual line continues the pre-Part D trend illustrating the expected trend in the absence of Part D.

The shaded area, December 2005-March 2006, represents the Part D phase-in period. These data points are not included in the regression model.

^b Difference of 4.6%, p = .003

^c Difference of 4.25%, p = .07

^d Difference of −10.96%, p = .04