. Author manuscript; available in PMC: 2010 Apr 26.

Published in final edited form as: Health Aff (Millwood). 2009 Feb 3;28(2):w317–w325. doi: 10.1377/hlthaff.28.2.w317

EXHIBIT 6.

Impact Of Reaching “Doughnut Hole” On Number Of Monthly Prescriptions Filled

	Number of monthly Rx filled after reaching “doughnut hole”
	All Rx	Generic Rx	Brand-name Rx
No coverage vs. full coverage in “doughnut hole”	−0.67^****	−0.40^****	−0.28^****
Generic coverage vs. full coverage in “doughnut hole”	−0.14^*	0.34^****	−0.56^****

Intercept	0.64	0.51	0.44
Number of monthly prescriptions filled before “doughnut hole”	0.89^****	0.94^****	0.71^****
Remaining in “doughnut hole” 6 months longer	−0.79^****	−0.20^***	−0.39^****

Female	0.24^****	0.07	0.18^****
Age 75–84	0.11^*	0.05	0.07^*
Age 85+	0.12	−0.03	0.17^***
2006 prospective risk scores	0.14^****	0.08^****	0.02

SOURCE: Authors’ calculation using study population as described in the text.

NOTES: Dependent variable is the number of monthly prescriptions filled after reaching the doughnut hole (between $2,250 and $5,100 in spending). Full coverage in the doughnut hole includes copayments, as described in the text.

p < 0.10

^***

p < 0.01

^****

p < 0.001