Table 3.

Significance Testing for Predictors of Outcome: Feedback Condition

	Rate of Change in OQ45 Total Score				Rate of Change in Alcohol Use				Rate of Change in Drug Use
Predictor	Estimate (se)	F (DF)	p	r	Estimate (se)	F (DF)	p	r	Estimate (se)	F (DF)	p	r
Employed	1.073 (8.474)	0.0 (107)	.900	.01	−.218 (369)	0.4 (109)	.556	.06	−.631 (.427)	2.2 (116)	.142	.14
Expectations for Improvement by Time	2.617 (2.471)	1.1 (109)	.292	.10	.021 (.114)	0.2 (125)	.857	.04	−.124 (.129)	0.9 (126)	.336	.01
Acuity of Biomedical Problems by Time	−6.484 (4.579)	2.0 (92)	.160	.15	−.284 (.199)	2.0 (93)	.157	.15	−.299 (.229)	1.7 (91)	.195	.14
Craving by Time	−.692 (.429)	2.6 (95)	.110	.16	−.041 (.019)	5.0 (97)	.028	.22	−.045 (.022)	4.4 (100)	.039	.20
Addiction Recovery Scale by Time	9.350 (4.205)	4.9 (106)	.028	.21	.510 (178)	8.2 (106)	.005	.27	.531 (.212)	6.2 (114)	.014	.23
Baseline OQ-45 Total Score by Time	−.279 (.113)	6.1 (96)	.015	.24	−.006 (.005)	1.6 (103)	.203	.13	−.001 (.006)	0.0 (105)	.841	.02
Baseline Level of Alcohol Use by Time	.490 (2.446)	0.0 (127)	.842	.02	−.375 (.101)	13.8 (104)	.000	.33	−.113 (.128)	1.0 (124)	.379	.08
Baseline Level of Drug Use by Time	.165 (2.413)	0.0 (98)	.946	.01	−.206 (.103)	4.0 (88)	.049	.21	−.265 (.121)	4.8 (95)	.031	.22

Note. Separate models were calculated for each predictor. The Predictor by Time term examines the prediction of rate of change over time (slope), using a log transformation of session number. The baseline score on the dependent variable, obtained at intake, is also included in the model. The dependent variables are scores from session 1 (which occurs subsequently to baseline) to session 12 (or earlier endpoint for those who terminate). Alcohol and drug use are days using in the past 7 days.