Table 2 Logistic regression identifying indicators of attrition

Step 1: Treatment as Covariate

Treatment Type (Group)

1.10

0.58

3.00

0.96-9.42

Step 2: Inclusion of Previously Supported Predictors

Treatment Type (Group)

1.33

0.63

3.77*

1.01-12.98

Age

−0.06

0.03

0.95

0.89-1.00

Gender (Male)

−0.17

0.62

0.85

0.25-2.83

Pretreatment Severity

0.02

0.01

1.02

0.99-1.05

Step 3: Final Model (Backwards Deletion of SCCS, Race, & their interaction)

Treatment Type (Group)

1.35

0.66

3.84*

1.043-14.125

Age

−0.06

0.03

0.95

0.893-1.001

Gender (Male)

−0.27

0.66

0.76

0.211-2.759

Pretreatment Severity

0.01

0.02

1.01

0.980-1.042

SCCS

0.04

0.02

1.04*

1.005-1.082