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

2301^***

(77.3)

0.098

38.2^***

(0.9)

0.018

2

Demo + Medical Diagnosis

2616^***

(75.6)

0.166

33.0^***

(0.9)

0.026

3

Demo + MedicalDx + MHDx

2485^***

(75.7)

0.185

28.1^***

(0.9)

0.039

4

+prior hospitalization

+prior long term care

1077^***

(53.9)

0.588

26.2^***

(0.9)

0.043

5

+prior and switch total costs/prior episode duration

384^***

(42.8)

0.740

24.4^***

(0.9)

0.056

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

500^***

(43.3)

0.741

22.2^***

(0.9)

0.060

8

Add: mono/poly

493^***

(43.4)

0.741

21.7^***

(0.9)

0.060

9

Add: prior depot use indicator

497^***

(43.5)

0.741

21.7^***

(0.9)

0.060

10

Add: time off Rx

567^***

(44.2)

0.741

20.3^***

(0.9)

0.060

11

Add: prior Rx mix

563^***

(111.3)

0.741

24.2^***

(2.3)

0.062