Table 1. Baseline characteristics of participants.
| CBT Group (n = 120) | Control Group (n = 120) | ||
|---|---|---|---|
| Mean age, M (SD), year | 40.9 (8.0) | 40.9 (9.0) | 0.981 |
| Male, n (%) | 93 (77.5%) | 93 (77.5%) | NA |
| Married, n (%) | 44 (36.7%) | 40 (33.3%) | 0.780 |
| ^Education level, M (SD), year | 9.9 (1.9) | 9.9 (1.8) | 0.784 |
| Less than high school, n (%) | 69 (57.5%) | 82 (68.3%) | 0.109 |
| Unemployed in last 3 years, n (%) | 90 (75.0%) | 79 (65.8%) | 0.157 |
| Chronic physical illness, n (%) | 16 (13.3%) | 14 (11.7%) | 0.846 |
| Age of first use, M (SD), year | 29.3 (8.4) | 29.0(8.8) | 0.776 |
| Years of use, M (SD), year | 9.8 (4.8) | 9.1 (4.2) | 0.205 |
| *Life-time injection, n (%) | 85 (70.8%) | 78 (65.0%) | 0.407 |
| *Mandatory rehabilitation history, n (%) | 90 (75.0%) | 78 (65.0%) | 0.121 |
| Re-education through labour, n (%) | 61 (50.8%) | 66 (55.0%) | 0.605 |
CBT, cognitive behavioral therapy; M, mean; SD, standard deviation.
^ There are two subjects from CBT group with missing data.
* There are three subjects from CBT group with missing data.