Descriptive parameters of patients on long-term stable clozapine monotherapy
| Descriptive parameters | Mean | SD |
| Age (years) | 33.75 | 10.04 |
| Age of onset of schizophrenia (years) | 20.68 | 6.83 |
| Duration of untreated psychosis (months) | 39.86 | 52.45 |
| Duration of treatment prior to starting clozapine (months) | 89.28 | 87.84 |
| Duration of treatment with clozapine (months) | 47.23 | 47.07 |
| Present clozapine dose (mg) | 192.5 | 114.8 |