Table 5 Multiple linear regression for each neuropsychological task that has shown differences between groups considering the independent variables Age of onset of substance use, Age, Years of education, Duration of drug use, Vocabulary and Block Design Scores; for the total sample.

From: Neuropsychological Performance in Polyconsumer Men Under Treatment. Influence of Age of Onset of Substance Use

Neuropsychological tasks

Adjusted R

F

IVa

β Standardized

p values

Tolerance

VIF

TMT-A (seconds)

0.29

16.84

Duration of drug use (yr)

−0.42

0.0001

0.91

1.09

   

Block Design (Direct Score)

0.26

0.02

0.91

1.09

Judgment of Line Orientation Test

 Number of correct answers

0.34

41.72

Block Design (Direct Score)

0.59

0.0001

1.00

1.00

 Reaction Time (milliseconds)

0.17

9.22

Age of onset of substance use (yr)

−0.26

0.01

0.99

1.01

   

Block Design (Direct Score)

−0.33

0.002

0.99

1.01

Tower of Hanoi

 Number of movementsb

       

 Reaction Time (seconds)

0.20

19.12

Duration of drug use (yr)

0.46

0.0001

1.0

1.0

  1. aOnly significant variables are presented that comprise each explicative model.
  2. bAny explicative model was significant.
  3. IV: Independent Variables; VIF: Variance inflation factor; TMT-A: Trail Making Test part A; yr: years.
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