Table 4.
Hierarchical regression results for working memory (n = 102)
| Predictors in the reduced model | Step 1 Beta(t-test)a | Step 2 Beta(t-test) | Step 3 Beta(t-test) | Step 4 Beta(t-test) |
|---|---|---|---|---|
| Drug treatment variables |
|
|
|
|
| BZD treatment (yes vs. no) |
-.34 |
-.30 |
-.28 |
-.28 |
|
t(100) = 3.56 |
t(99) = 3.14 |
. t(98) = 2.83 |
t(97) = 2.81 |
|
|
p = 0.0006 *** |
p = 0.002 ** |
p = 0.006 * |
p = 0.006 * |
|
| Duration of OST (long vs. short)b |
|
.17 |
.17 |
.16 |
| |
t(99) = 1.81 |
t(98) = 1.72 |
t(97) = 1.69 |
|
| |
p = 0.074 # |
p = 0.088 # |
p = 0.094 # |
|
| The number of psychoactive drugs, other than opioid or BZD (high vs. low)c |
|
|
-.06 |
.07 |
| OST drug type (buprenorphine vs. methadone) |
|
|
|
-.03 |
| R2 (adjusted) |
.104 |
.124 |
.119 |
.100 |
| Model (ANOVA)a |
F(1,100) = 12.68 |
F(2,99) = 8.12 |
F(3,98) = 5.52 |
F(4,97) = 4.12 |
|
p = 0.0006 *** |
p =0.0006 *** |
p = 0.002 ** |
p = 0.004 ** |
|
| Change (ANOVA)a | |
F (1,99) = 3.26 |
|
|
| p = 0.074# | p = 0.52 | p = 0.76 |
aOnly p-value shown when p ≥ 0.10.
bConsidered as short when between six and twelve months.
cConsidered as low up to one drug.
***p < 0.00. **p < 0.01. *p < 0.05. #p < 0.10.