Multiple regression analyses with change

Step

Variable

R²

Δ R²

Cohen’s f^2‡

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.

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