Variables

Cluster 1
(n=60)

Cluster 2
(n=40)

Test

p

BIS-11, mean (SD)

71.23 (11.76)

67.07 (5.60)

t=2.08, 98 df

0.04*

Years of cocaine use, mean (SD)

12.68 (5.79)

4.80 (2.59)

t=8.08, 98 df

<0.01**

Educational Level, n (%)

1-8^th
9-11^th
≥ 12^th

10 (16.67)
5 (8.33)
45 (75)

6 (15)
19 (47.50)
15 (37.50)

χ²=21.01, 2 df

<0.01**

Previous treatment for cocaine addiction,
 n (%)

33 (55)

6 (15)

χ²=16.14, 1 df

<0.01**

Family history of cocaine dependence, n (%)
First-degree parents
Second degree parents
None

30 (50)
18 (30)
12 (20)

0
9 (22.5)
31 (77.5)

χ²=45.28, 2 df

<0.01**