Table 3. Comparison of UHR and Control ERPs for the passive auditory task.
| Control | UHR | Statistic | p | Cohen’s d | ||
|---|---|---|---|---|---|---|
| n | 58 | 80 | ||||
| Age | 19.1 (3.18) | 18.6 (2.68) | t(136) = .96 | .34 | ||
| Male/Female | 30/28 | 38/42 | χ2(1) = .24 | .62 | ||
| MMNAmplitude | ||||||
| Duration | -4.80 (2.12) | -4.49 (2.28) | F(1,135) = .32 | .57 | .098 | |
| Frequency | -3.00 (1.66) | -3.13 (1.58) | F(1,135) = .33 | .57 | .099 | |
| Intensity | -3.01 (1.52) | -3.14 (1.96) | F(1,135) = .30 | .58 | .095 | |
| MMNLatency | ||||||
| Duration | 183.6 (13.3) | 185.5 (16.9) | F(1,135) = .32 | .58 | .097 | |
| Frequency | 164.3 (19.8) | 163.3 (24.0) | F(1,135) = .29 | .59 | .093 | |
| Intensity | 160.1 (27.9) | 159.3 (26.4) | F(1,135) = .12 | .74 | .059 | |
| P3aAmplitude | ||||||
| Duration | 3.27 (2.17) | 3.32 (1.93) | F(1,135) = .15 | .70 | .066 | |
| Frequency | 2.59 (1.68) | 2.54 (2.01) | F(1,135) < .01 | .99 | .003 | |
| Intensity | 1.82 (1.78) | 1.79 (1.75) | F(1,135) < .01 | .96 | .010 | |
| P3aLatency | ||||||
| Duration | 287.9 (18.3) | 286.8 (21.2) | F(1,135) = .18 | .67 | .074 | |
| Frequency | 274.8 (21.8) | 277.3 (21.2) | F(1,135) = .19 | .67 | .075 | |
| Intensity | 269.4 (27.5) | 279.4 (31.5) | F(1,135) = 3.42 | .07 | .318 |
Means, standard deviations and effect sizes for the comparison of ERP measures in UHR and controls at baseline. Mean (SD) are raw scores in μV or ms. F, p and d statistics are from an ANCOVA co-varied for age (performed separately for each deviant type for MMN and P3a measures). There are no statistically significant differences between UHR and control groups in this table.