Step Variable R2 Δ R2 Cohen’s f2‡ F p value
Change in     COWAT category fluency 1


2

3
4
5
Premorbid IQ, treatment sessions, treatment content, treatment focus poly drug use, past 24 hours alcohol use, gender, current anxiolytic, current antidepressant, age, age at leaving school.
Baseline BDI-II total score, baseline mean drinks/week, baseline heavy drinking days/week, baseline COWAT category fluency.
Change in mean drinks/week baseline-12 months.
Change in heavy drinking days/week baseline-12 months.
Change in BDI-II total score baseline-12 months
0.268


0.431

0.444
0.452
0.544
0.268


0.163

0.014
0.007
0.093

0.366


0.286

0.023
0.015
0.202

1.462


2.863

0.961
0.519
7.528
0.181


0.035

0.333
0.476
0.009**
Change in
CWI
inhibition switching
1


2

3
4
5
Premorbid IQ, treatment sessions, treatment content, treatment focus poly drug use, past 24 hours alcohol use, gender, current anxiolytic, current antidepressant, age, age at leaving school.
Baseline BDI-II total score, baseline mean drinks/week, baseline heavy drinking days/week, baseline CWI inhibition switching.
Change in mean drinks/week baseline-12 months.
Change in heavy drinking days/week baseline-12 months.
Change in BDI-II total score baseline-12 months
0.383


0.690

0.723
0.738
0.752
0.383


0.307

0.033
0.015
0.014
0.621


0.990

0.119
0.057
0.056
2.479


9.902

4.673
2.190
2.038
0.016


0.000***

0.037
0.147
0.162
1 session versus 10 sessions; Alcohol versus depression focus; Integrated versus single-focus
Effect size attributable to the addition of variables at each step
* Significant at the 0.05 level (Bonferroni corrected); ** Significant at the 0.01 level (Bonferroni corrected); *** Significant at the 0.001 level (Bonferroni corrected)
Table 5: Multiple regression analyses with change in depression and alcohol use as predictors of change in executive function.