Table 2.
Descriptive statistics for ABR latency and amplitude. Mean and standard deviations (SD) are shown for ABR latency (ms) and amplitude (nV) for each ABR recording condition at 90 and 80 dB nHL. For ABR amplitude (bottom panel), the coefficient of variation (CV) is denoted in parentheses.
| ABR Recording Condition
|
||||
|---|---|---|---|---|
| 4 kHz tone bursts | Click | |||
|
| ||||
| Latency | Mean | SD | Mean | SD |
| Wave I 90 dB nHL | ||||
| TM | 1.99 | 0.08 | 1.58 | 0.07 |
| Mastoid | 2.00 | 0.09 | 1.60 | 0.10 |
|
| ||||
| Wave I 80 dB nHL | ||||
| TM | 2.16 | 0.09 | 1.64 | 0.08 |
| Mastoid | 2.16 | 0.10 | 1.65 | 0.09 |
|
| ||||
| Wave V 90 dB nHL | ||||
| TM | 5.95 | 0.22 | 5.49 | 0.17 |
| Mastoid | 5.96 | 0.17 | 5.52 | 0.18 |
|
| ||||
| Wave V 80 dB nHL | ||||
| TM | 6.03 | 0.20 | 5.57 | 0.17 |
| Mastoid | 6.04 | 0.18 | 5.59 | 0.17 |
| 4 kHz tone bursts | Click | |||
|---|---|---|---|---|
|
| ||||
| Amplitude | Mean | SD (CV) | Mean | SD (CV) |
| Wave I 90 dB nHL | ||||
| TM | 816.97 | 334.26 (40.91) | 870.29 | 314.56 (36.14) |
| Mastoid | 386.88 | 141.30 (36.52) | 428.01 | 153.73 (35.92) |
|
| ||||
| Wave I 80 dB nHL | ||||
| TM | 738.76 | 316.14 (42.79) | 769.13 | 329.61 (42.85) |
| Mastoid | 367.66 | 134.84 (36.68) | 397.29 | 136.77 (34.43) |
|
| ||||
| Wave V 90 dB nHL | ||||
| TM | 359.07 | 108.59 (36.68) | 540.49 | 135.38 (25.05) |
| Mastoid | 459.43 | 149.53 (30.24) | 661.25 | 188.89 (28.57) |
|
| ||||
| Wave V 80 dB nHL | ||||
| TM | 324.48 | 115.82 (35.69) | 494.75 | 142.04 (28.71) |
| Mastoid | 395.39 | 130.58 (33.03) | 583.78 | 187.37 (32.10) |