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Psychology: Research and Review

Table 1 Demographic characteristics, comorbid psychiatric disorders, history of drug use, and treatment outcome among participants who crossed and did not crossover

From: Contingency management is effective in promoting abstinence and retention in treatment among crack cocaine users with a previous history of poor treatment response: a crossover trial

 

Participants that crossed over to CMC (n = 16)

Participants that did not crossover to CMC (n = 16)

p value1

n (%)

Mean ± SD

n (%)

Mean ± SD

Baseline variables

 Age (years)

 

37.3 ± 8.4

 

33.9 ± 8.4

0.337

 Male

14 (87.5)

 

14 (87.5)

 

1.000

 Education (years of schooling)

 

10.1 ± 3.3

 

10 ± 4.2

0.612

 Unemployment

11 (68.8)

 

16 (100)

 

0.043

 Homelessness

3 (18.8)

 

6 (37.5)

 

0.433

 Age at onset of crack use (years)

 

24.7 ± 8.4

 

23.2 ± 6.7

0.740

 Duration of crack use (years)

 

12.6 ± 7.8

 

10.8 ± 7.3

0.444

 Has slept on the streets due to crack use

6 (37.5)

 

12 (75.5)

 

0.073

 Has been to Crackland2

14 (87.5)

 

16 (100)

 

0.484

 History of inpatient treatment

14 (87.5)

 

12 (75.5)

 

1.000

 Number of previous treatment attempts

 

4.6 ± 5.4

 

3.1 ± 3.1

0.282

 Positive crack cocaine urine sample at baseline

9 (56.3)

 

7 (43.8)

 

0.654

 Alcohol dependence

9 (56.3)

 

12 (75.5)

 

0.458

 Multiple substance dependence

12 (75.0)

 

12 (75.0)

 

1.000

 Psychotic symptoms

10 (62.5)

 

5 (31.2)

 

0.156

 Beck Depression Inventory-II score

 

23.8 ± 12.6

 

19.9 ± 12.6

0.401

 Beck Anxiety Inventory score

 

21.0 ± 14.0

 

10.6 ± 9.4

0.022

Treatment outcome variables

 Treatment attendance (sessions)

 

5.3 ± 7.7

 

2.3 ± 3.8

0.182

 Retention in treatment (weeks)

 

3.9 ± 4.3

 

2.6 ± 3.7

0.489

 Proportion of negative samples submitted

 

12.2 ± 19.9

 

5.7 ± 10.8

0.265

 Longest duration of abstinence (weeks)

 

1.1 ± 2.2

 

0.5 ± 0.9

0.304

 Retained and abstinent at the last week of treatment

0 (0)

 

0 (0)

 

1.000

 3 or more weeks of abstinence

2 (12.5)

 

0 (0)

 

0.484

 Completely abstinent during treatment

0 (0)

 

0 (0)

 

1.000

  1. CMC contingency management condition, SD standard deviation
  2. 1p values were obtained using independent t test for continuous variables and Fisher’s exact test for dichotomous variables
  3. 2Crackland is a region of downtown São Paulo where thousands of people consume crack openly