Table 3 Risk of relapse after the index substance use for related variables estimated by Cox proportional hazards model
From: Difference in long-term relapse rates between youths with ketamine use and those with stimulants use
Variables | Relapse | Unadjusted model | Adjusted model | ||
|---|---|---|---|---|---|
n/N (%) | HR (95% CI) | P-value | aHR (95% CI) | P-value | |
Age (years) | – | 0.91 (0.72–1.16) | 0.450 | 1.00 (0.77–1.28) | 0.968 |
Gender | |||||
 Male | 47/104 (45.2) | 1 |  | 1 |  |
 Female | 11/31 (35.5) | 0.83 (0.43–1.60) | 0.577 | 0.89 (0.45–1.77) | 0.735 |
Substance use | |||||
 Ketamine | 32/92 (34.8) | 1 |  | 1 |  |
 Stimulants | 26/43 (60.5) | 1.58 (0.93–2.68) | 0.090 | 1.86 (1.06–3.28) | 0.032* |
Previous conviction record | |||||
 Without | 36/94 (38.3) | 1 |  | 1 |  |
 With | 22/41 (53.7) | 1.48 (0.87–2.51) | 0.152 | 1.56 (0.91–2.67) | 0.106 |
Academic or social status | |||||
 Employed | 12/42 (28.6) | 1 |  | 1 |  |
 Attending school | 22/43 (51.2) | 2.23 (1.10–4.52) | 0.025* | 2.77 (1.28–6.02) | 0.010* |
 Dropout and unemployed | 24/50 (48.0) | 2.06 (1.03–4.12) | 0.042* | 1.99 (0.97–4.08) | 0.061 |
Family status | |||||
 Double-parent families | 26/61 (42.6) | 1 |  | 1 |  |
 Single-parent families | 26/58 (44.8) | 1.15 (0.67–1.97) | 0.624 | 1.16 (0.66–2.02) | 0.608 |
 Grandparent(s) | 6/16 (37.5) | 0.81 (0.33–1.97) | 0.637 | 0.72 (0.28–1.86) | 0.492 |