Table 2.
ERP Amplitudes to 97-dB Tones With 70-dB Background White Noise
| Group | Fz | Cz | Pz |
| N1 | |||
| FHSz (n = 32) | −4.5 (2.5) | −4.3 (2.5) | −2.4 (1.9) |
| Younger controls (n = 32) | −5.0 (2.5) | −5.1 (2.8) | −3.0 (2.1) |
| ChSz (n = 45) | −3.9 (2.2) | −3.9 (2.2) | −2.2 (1.5) |
| Older controls (n = 34) | −5.1 (2.2) | −5.1 (2.1) | −2.8 (1.9) |
| P2 | |||
| FHSz (n = 32) | 2.7 (2.6) | 4.7 (3.0) | 3.3 (2.6) |
| Younger controls (n = 32) | 2.8 (2.5) | 5.3 (2.9) | 4.0 (2.2) |
| ChSz (n = 45) | 2.5 (1.8) | 4.1 (2.1) | 2.8 (1.8) |
| Older controls (n = 34) | 3.5 (2.1) | 5.2 (2.0) | 3.3 (1.7) |
Note: Values are mean (SD) μV. ERP, event-related potential; FHSz, first-hospitalized schizophrenia; ChSz, chronically ill schizophrenia.