| 1. At least 2 of the following 6 negative symptoms must be present: |
| Restricted affect |
| Diminished emotional range |
| Poverty of speech |
| Curbing of interests |
| Diminished sense of purpose |
| Diminished social drive |
| 2. Some combination of 2 or more of the above negative symptoms have been present for the preceding 12 months and always present during periods of clinical stability. |
| 3. The negative symptoms are primary, ie, not secondary to factors other than the disease process, eg, |
| Anxiety |
| Drug effects |
| Suspiciousness or other psychotic symptoms |
| Mental retardation |
| Depression |
| 4. The patient meets DSM-III criteria for schizophrenia |
