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

1678^***

(217.4)

0.147

107.0^***

(4.0)

0.037

2

Demo + Medical Diagnosis

1796^***

(211)

0.203

106.1^***

(4.0)

0.053

3

Demo + MedicalDx + MHDx

1901^***

(208.8)

0.220

108.0^***

(3.9)

0.068

4

+prior hospitalization

+prior long term care

1289^***

(154.9)

0.571

106.6^***

(3.9)

0.071

5

+prior and switch total costs/prior episode duration

1171^***

(136.4)

0.667

24.6^***

(3.1)

0.453

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

1128^***

(145.4)

0.670

26.3^***

(3.2)

0.453

8

Add: mono/poly

1122^***

(145.6)

0.670

25.4^***

(3.2)

0.454

9

Add: prior depot use indicator

1270^***

(149.1)

0.670

26.4^***

(3.2)

0.454

10

Add: time off Rx

11

Add: prior Rx mix

1262^***

(152.2)

0.670

37.2^***

(3.2)

0.459