Table 4 Hierarchical regression results for working memory (n = 102)

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