Table 1.
The demographic and clinical characteristic of the two groups
| 20 Hz (n=33) | Sham (n=27) | Group comparison | ||
|---|---|---|---|---|
| Mean (SD) | Mean (SD) | t/x2 | p | |
| Age (years) | 28.97 (7.40) | 30.63 (8.25) | 0.416 | 0.521 |
| Education (years) | 12.70 (2.54) | 12.41 (2.34) | 0.244 | 0.623 |
| Course of illness (years) | 7.20 (5.46) | 8.11 (5.64) | 0.001 | 0.977 |
| Dose of chlorpromazine equivalents (mg) | 400.48 (252.17) | 421.93 (209.23) | 0.298 | 0.587 |
| IQ | 92.17 (14.25) | 95.72 (14.37) | 0.100 | 0.754 |
| PANSS-total | 68.15 (5.535) | 69.93 (6.528) | 1.824 | 0.182 |
| PANSS-positive | 14.61 (3.381) | 15.26 (2.669) | 0.976 | 0.327 |
| PANSS-negative | 21.70（3.349） | 22.63（3.824） | 1.323 | 0.255 |
| PANSS-general | 31.85（3.022） | 32.04（3.391） | 1.212 | 0.275 |
| SANS | 48.09（11.204） | 50.33（12.551） | 0.405 | 0.527 |
| CGI | 4.88 (0.33) | 4.93 (0.55) | 2.171 | 0.146 |
| Gender | ||||
| Male | 22 | 19 | 0.094 | 0.759 |
| Female | 11 | 8 | ||
Abbreviations: IQ intelligence quotient; PANSS, Positive and Negative Syndrome Scale; SANS, Scale for the Assessment of Negative Symptoms; CGI, clinical global impression.