Table 1.
Baseline demographics
| Characteristic | Control | Contingency Management (CM) | ||
|---|---|---|---|---|
| n/N or median or utility score | %, SD, or IQR | n/N or median or utility score | %, SD, or IQR | |
| Male | 240/273 | 88 | 238/278 | 86 |
| Age mean (SD) | 25 | (4) | 24 | (4) |
| Ethnicity | ||||
| White | 144/273 | 53 | 148/277 | 53 |
| Black | 62/273 | 23 | 65/277 | 23 |
| Asian | 30/273 | 11 | 29/277 | 10 |
| Other | 37/273 | 14 | 35/277 | 13 |
| Marital status | ||||
| Single | 253/273 | 93 | 259/278 | 93 |
| Married or cohabiting | 14/273 | 5 | 17/278 | 6 |
| Other | 6/273 | 2 | 2/278 | 1 |
| Educational attainment | ||||
| No qualifications | 48/273 | 18 | 43/277 | 16 |
| GCSE or equivalent | 104/273 | 38 | 133/277 | 48 |
| A level or equivalent | 67/273 | 25 | 58/277 | 21 |
| Post 18 education (including HND, trade, degree) | 54/273 | 20 | 43/277 | 16 |
| Ever had open market employment | 223/273 | 82 | 240/278 | 86 |
| Any current work or study | 67/273 | 25 | 73/278 | 26 |
| Diagnosis | ||||
| Schizophrenia or schizo-affective disorder | 80/256 | 31 | 90/268 | 34 |
| Bipolar affective disorder | 26/256 | 10 | 19/268 | 7 |
| Depression with psychotic symptoms | 11/256 | 4 | 5/268 | 2 |
| Other psychosis | 139/256 | 54 | 154/268 | 57 |
| Cannabis use | ||||
| 1–3 times a week | 77/273 | 28 | 78/278 | 28 |
| More than 3 times a week | 196/273 | 72 | 200/278 | 72 |
| Any work or study | 58/183 | 32 | 58/189 | 31 |
| Cannabis-positive urine | 210/262 | 80 | 214/272 | 79 |
| Number of days using cannabis* | 108 | (67, 156) | 114 | (70, 162) |
| History of cannabis dependence | 238/273 | 87 | 236/278 | 85 |
| Current cannabis dependence | 183/238 | 77 | 185/236 | 78 |
| PANSS positive symptoms median (IQR) | 12 | (9, 17) | 13 | (9, 16) |
| PANSS negative symptoms median (IQR) | 14 | (11, 19) | 14 | (10, 19) |
| EQ-5D-3L utility score | 0.7619 | 0.7652 | ||
| SF-6D utility score | 0.6789 | 0.6833 | ||