Table 1. Description of sample at baseline and follow-up (n, %).
| Baseline information | Baseline (N = 1212) |
Two-year follow-up ƚ | Statistics | P | |
|---|---|---|---|---|---|
| Premature termination (n = 527) | Maintain (n = 684) | ||||
| Socio-demographics | |||||
| Age at initial treatment (years) (mean ± SD) (range: 19–69) | 39.24 ± 6.24 | 38.34 ± 6.41 | 39.93 ± 6.03 | t = -4.44 | <0.001 |
| ≤ 30 | 102 (8.4) | 59 (11.2) | 43 (6.3) | χ2 = 14.29 | 0.003 |
| 31–40 | 612 (50.5) | 273 (51.8) | 339 (49.6) | ||
| 41–50 | 460 (38.0) | 184 (34.9) | 275 (40.2) | ||
| > 50 | 38 (3.1) | 11 (2.1) | 27 (3.9) | ||
| Gender | |||||
| Male | 934 (77.1) | 404 (76.7) | 529 (77.3) | χ2 = 0.13 | 0.72 |
| Female | 278 (22.9) | 123 (23.3) | 155 (22.7) | ||
| Education level | |||||
| Primary and below | 81 (6.7) | 32 (6.1) | 49 (7.2) | χ2 = 3.28 | 0.19 |
| Secondary | 1076 (88.8) | 465 (88.2) | 610 (89.2) | ||
| Tertiary | 55 (4.5) | 30 (5.7) | 25 (3.7) | ||
| Marital status | |||||
| Married | 694 (57.3) | 292 (55.4) | 401 (58.6) | χ2 = 1.26 | 0.26 |
| Other marital status | 518 (42.7) | 235 (44.6) | 283 (41.4) | ||
| Employment status | |||||
| Unemployed | 851 (70.2) | 371 (70.4) | 479 (70.0) | χ2 = 0.02 | 0.89 |
| Employed | 361 (29.8) | 156 (29.6) | 205 (30.0) | ||
| Drug use characteristics | |||||
| Age at initial drug use (year) (mean ± SD) (range: 12–66) | 28.92 ± 7.70 | 28.21 ± 7.50 | 29.46 ± 7.80 | t = -2.80 | 0.005 |
| ≤ 20 | 189 (15.6) | 102 (19.4) | 87 (12.7) | χ2 = 11.17 | 0.011 |
| 21–30 | 532 (43.9) | 220 (41.7) | 312 (45.6) | ||
| 31–40 | 396 (32.7) | 170 (32.3) | 225 (32.9) | ||
| > 40 | 95 (7.8) | 35 (6.6) | 60 (8.8) | ||
| Detoxification before initial MMT | |||||
| Yes | 1083 (89.4) | 468 (88.8) | 614 (89.8) | χ2 = 0.29 | 0.59 |
| No | 129 (10.6) | 59 (11.2) | 70 (10.2) | ||
| Drug using methods over the past 6 months | |||||
| Oral | 384 (31.7) | 163 (30.9) | 220 (32.2) | χ2 = 0.43 | 0.80 |
| Injection | 786 (64.9) | 347 (65.8) | 439 (64.2) | ||
| Others | 42 (3.5) | 17 (3.2) | 25 (3.7) | ||
| Syringe Sharing experiences | |||||
| Yes | 65 (5.4) | 25 (4.7) | 40 (5.8) | χ2 = 0.71 | 0.40 |
| No | 1147 (94.6) | 502 (95.3) | 644 (94.2) | ||
| Initial morphine urine test | |||||
| Positive | 90 (7.4) | 48 (9.1) | 41 (6.0) | χ2 = 4.24 | 0.04 |
| Negative | 1122 (92.6) | 479 (90.9) | 643 (94.0) | ||
MMT: methadone maintenance treatment.
ƚ One patient lost to follow-up due to transferring to another clinic.