Table 2.
Past substance use diagnostic characteristics of the schizophrenia and control participants.
| Substance use characteristics | SCZ + SA (n = 17) | CON + SA (n = 12) | t or χ2 | p |
|---|---|---|---|---|
| N (%) | N (%) | |||
| Alcohol only diagnosis | – | 5 (41.7%) | 8.55 | 0.007 |
| Alcohol | 11 (64.7%) | 9 (75%) | 0.34 | 0.694 |
| Cannabis | 11 (64.7%) | 4 (33.3%) | 2.77 | 0.139 |
| Cocaine | 3 (17.6%) | 4 (33.3%) | 0.94 | 0.403 |
| Hallucinogen | 3 (17.6%) | 1 (8.3%) | 0.51 | 0.622 |
| Stimulant | 2 (11.8%) | 0 | 1.51 | 0.498 |
| Opiate | 1 (5.9%) | 0 | 0.73 | 1.000 |
| Sedative | 2 (11.8%) | 0 | 1.51 | 0.498 |
| Polysubstance | 3 (17.6%) | 1 (8.3%) | 0.51 | 0.622 |
| Number of dependence diagnoses | 15 (88.2%) | 7 (58.3%) | 3.43 | 0.092 |
| More than one substance use diagnosis | 14 (82.4%) | 5 (41.7) | 5.15 | 0.046 |
| Number of substance use diagnoses | – | – | 5.85 | 0.211 |
| 1 Diagnosis | 3 (17.6) | 7 (58.3) | – | – |
| 2 Diagnoses | 8 (47.1) | 3 (25) | – | – |
| 3 Diagnoses | 4 (23.5) | 2 (16.7) | – | – |
| 4 Diagnoses | 1 (5.9) | 0 | – | – |
| 5 Diagnoses | 1 (5.9) | 0 | – | – |
SCZ + SA, schizophrenia patients with past substance abuse; CON + SA, control participants with past substance abuse. Alcohol through polysubstance includes both abuse and dependence diagnoses.