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 (%)

1-8th
9-11th
≥ 12th

 

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**

BIS: Barratt Impulsiveness Scale
*: p<0.05
**: p<0.01
Table 2: Division of subjects into two clusters (LCA, 2 classes).