Table 2 Demographic and clinical features: comparison between patients aged > or < 65 years
|  | Pts aged ≥ 65 (N = 20) | Pts aged < 65 (N = 20) |  |  | ||
|---|---|---|---|---|---|---|
| Â | Mean | Sd | Mean | Sd | T/z | p |
Age at onset | 48.9 | 23.6 | 25.6 | 12.0 | 3.9 | 0.0004 |
|  | N | % | N | % | χ2 | p |
Irritability | 12 | 60 | 12 | 60 | 0 | 1 |
Delusions | 12 | 60.0 | 14 | 70.0 | 0.44 | 0.51 |
Hallucinations | 6 | 30.0 | 1 | 5.0 | 4.33 | 0.09* |
Family history for mood disorders (two missing values in both groups) | 6 | 33.3 | 12 | 66.7 | 4.0 | 0.05 |