Total Cost First Post-Treatment Year

Duration of Drug Therapy

Model

Model Specification

OLS

(SE)

R-squared

In OLS

OLS

(SE)

R-squared

In OLS

1

Demographic variables

−4936^***

(185.1)

0.105

170.0^***

(2.1)

0.075

2

Demo + Medical Diagnosis

−4549^***

(180.8)

0.152

168.7^***

(2.1)

0.086

3

Demo + MedicalDx + MHDx

−4390^***

(179.9)

0.165

168.6^***

(2.1)

0.095

4

+prior hospitalization

+prior long term care

−1741^***

(136.6)

0.520

167.6^***

(2.1)

0.096

5

+prior and switch total costs/prior episode duration

−289^**

(112.2)

0.677

146.7^***

(2.1)

0.171

6

Model 6 Specification Using Data for All Episodes

751^***

(37.8)

0.712

55.0^***

(0.8)

0.157

7

Add: prior episode count

66

(115.4)

0.676

142.6^***

(2.1)

0.173

8

Add: mono/poly

65

(115.6)

0.676

143.3^***

(2.1)

0.174

9

Add: prior depot use indicator

74

(118.7)

0.676

143.4^***

(2.1)

0.174

10

Add: time off Rx

11

Add: prior Rx mix

−156

(122.0)

0.677

155.7^***

(2.2)

0.179