| Matrix group (n = 20) | Methylphenidate group (n = 22) | Matrix combination with methylphenidate group (n = 21) | Control group (n = 22) | P2 |
---|---|---|---|---|---|
Age (y) | 30.7 ± 6.1 | 31.8 ± 5.6 | 29.4 ± 2.7 | 31.0 ± 2.7 | 0.39 |
Education status (%) | |||||
 Elementary | 5 (25) | 9 (40.9) | 8 (38.1) | 7 (31.8) |  |
 Intermediate | 8 (40) | 4 (18.3) | 3 (14.3) | 7 (31.8) |  |
 Diploma | 5 (25) | 6 (27.3) | 8 (38.1) | 5 (22.7) | 0.52†|
 College | 0 (0) | 3 (13.6) | 1 (4.8) | 1 (4.5) |  |
 Bachelor of science (BSc) | 2 (10) | 0 (0) | 1 (4.8) | 2 (9.1) |  |
Marital status (%) | |||||
 Permanent marriage | 8 (40) | 3 (13.6) | 6 (28.6) | 8 (36.4) |  |
 Single | 6 (30) | 11 (50) | 6 (28.6) | 7 (31.8) | 0.49††|
 Widow/Divorced | 6 (30) | 8 (36.4) | 9 (42.9) | 7 (31.8) |  |
Job (%) | |||||
 Unemployed | 12 (60) | 14 (63..6) | 7 (33.3) | 8 (36.4) |  |
 Employed | 2 (10) | 1 (4.5) | 2 (9.5) | 0 (0) | 0.09†|
 Others | 6 (30) | 7 (31.8) | 12 (57.1) | 14 (63.6) |  |
Methadone dose (mL/d) | 16.8 ± 4.4 | 18.6 ± 5.3 | 18.1 ± 5.7 | 18.0 ± 3.7 | 0.67 |
Duration of MMT (y) | 4.7 ± 2.3 | 4.1 ± 2.0 | 5.4 ± 2.1 | 4.1 ± 1.9 | 0.16 |
Dose of METH use (g/week) | 0.35 ± 0.2 | 0.43 ± 0.2 | 0.35 ± 0.2 | 0.43 ± 0.2 | 0.55 |
Frequency of METH use (week) | 2.9 ± 1.6 | 3.7 ± 2.0 | 3.4 ± 1.8 | 3.4 ± 1.7 | 0.53 |
Duration of METH use (y) | 1.8 ± 0.83 | 2.1 ± 0.94 | 1.7 ± 0.76 | 2.3 ± 0.94 | 0.12 |