Table 2 Descriptive statistics (frequencies or mean and standard error) of data related to SUD for the two groups and the statistical contrasts carried out.

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

Substance use data

OSU ≤ 16 (N = 41)

OSU ≥ 17 (N = 39)

Statistical contrasts

p values

Consumption pattern

 One substance

12.2%

23.1%

U = 712.50

0.203

 Two substances

22.1%

41.0%

U = 647.00

0.068

 Polydrug use

65.7%

35.9%

U = 560.00

0.008

Substances useda

 Cocaine

95.1%

94.9%

U = 797.50

0.959

 Alcohol

82.9%

71.8%

U = 710.50

0.236

 Cannabis

58.5%

38.5%

U = 639.00

0.074

 Opioids

22%

15.4%

U = 747.00

0.455

 Ecstasy

22%

7.7%

U = 685.50

0.076

 Hallucinogens

17.1%

5.1%

U = 704.00

0.093

 Sedatives

4.9%

5.1%

U = 797.50

0.959

Age of OSU (yr)

14.93 ± 0.19

23.03 ± 1.12

U = 1.50

0.0001

Duration of drug use (yr)

19.39 ± 1.26

13.12 ± 1.62

t = 3.58

0.001

Typology of treatment regimen

  

X2 = 9.12

0.003

 Residential

82.9%

51.3%

  

 Ambulatory

17.1%

48.7%

  

Number of psychotropics including treatment

  

U = 689.50

0.215

 None

56.1%

71.8%

  

 One

26.8%

12.8%

  

 More than one

17.1%

15.4%

  

Months of abstinence

7.76 ± 0.71

8.31 ± 0.73

U = 713.00

0.399

Number of relapses

1.49 ± 0.32

0.64 ± 0.16

U = 679.50

0.039

Clinical Global Impression (CGI)

2.36 ± 0.23

2.16 ± 0.20

U = 681.00

0.659

  1. aPercentages will not equal 100 as each participant may take more than one substance of abuse.
  2. OSU ≤ 16: Onset of substance use at age 16 or earlier; OSU ≥ 17: Onset of substance use at age 17 or later; OSU: Onset of substance use; yr: years.