Table 3.
F-wave studies in upper and lower extremity nerves.
| Parameters | SCA3 (1) | PreSCA3 (2) | Control (3) | p-value | Overall | ||
|---|---|---|---|---|---|---|---|
| 1 vs. 3 | 2 vs. 3 | 1 vs. 2 | P-value | ||||
| Median nerve | |||||||
| Min F latency (ms) | 25.16 ± 1.83 | 24.08 ± 1.76 | 24.09 ± 1.53 | 0.032 | 0.996 | 0.040 | 0.040 |
| F persistence (%) | 89.92 ± 18.96 | 97.99 ± 6.23 | 99.54 ± 1.96 | 0.021 | 0.853 | 0.045 | 0.032 |
| Mean Famp (μV) | 332.2 ± 165.4 | 293.6 ± 113.6 | 241.3 ± 62.92 | 0.008 | 0.150 | 0.320 | 0.030 |
| Maximum Famp (μV) | 769.6 ± 405.6 | 733.6 ± 296.7 | 485.9 ± 186.0 | 0.001 | 0.014 | 0.711 | 0.004 |
| F/M amplitude ratio (%) | 2.48 ± 1.06 | 1.79 ± 0.72 | 1.67 ± 0.60 | 0.001 | 0.543 | 0.009 | 0.001 |
| Giant F-waves (%) | 0.66 ± 3.44 | 0 ± 0 | 0 ± 0 | NA | NA | NA | NA |
| Frequency of Patients with giant F-waves | 2/34 | 0/18 | 0/27 | NA | NA | NA | NA |
| Ulnar nerve | |||||||
| Min F latency (ms) | 24.53 ± 1.96 | 23.93 ± 1.26 | 23.91 ± 1.57 | 0.214 | 0.968 | 0.239 | 0.342 |
| F persistence (%) | 99.61 ± 1.25 | 97.43 ± 14.15 | 100 ± 0 | NA | NA | 0.735 | NA |
| Mean Famp (μV) | 369.3 ± 135.8 | 316.9 ± 140 | 263.3 ± 70.72 | 0.007 | 0.221 | 0.174 | 0.024 |
| Maximum Famp (μV) | 879.5 ± 457.2 | 712.8 ± 400.8 | 468.7 ± 124.9 | 0.001 | 0.048 | 0.192 | 0.003 |
| F/M amplitude ratio (%) | 2.96 ± 1.62 | 2.34 ± 0.91 | 1.83 ± 0.56 | 0.003 | 0.229 | 0.100 | 0.011 |
| Giant F-waves (%) | 1.18 ± 2.84 | 0.53 ± 1.78 | 0 ± 0 | NA | NA | 0.371 | NA |
| Frequency of Patients with giant F-waves | 6/34 | 2/19 | 0/27 | NA | NA | 0.487 | NA |
| Tibial nerve | |||||||
| Min F latency (ms) | 43.15 ± 3.54 | 41.99 ± 2.27 | 43.28 ± 2.89 | 0.871 | 0.174 | 0.194 | 0.337 |
| F persistence (%) | 100 ± 0 | 100 ± 0 | 100 ± 0 | NA | NA | NA | NA |
| Mean Famp (μV) | 553.5 ± 271.6 | 484.3 ± 287 | 400.8 ± 157.2 | 0.012 | 0.230 | 0.317 | 0.043 |
| Maximum Famp (μV) | 1020 ± 456.6 | 1074 ± 658.4 | 687.5 ± 321.8 | 0.006 | 0.007 | 0.687 | 0.008 |
| F/M amplitude ratio (%) | 2.96 ± 1.35 | 2.33 ± 1.13 | 2.07 ± 1.32 | 0.006 | 0.462 | 0.086 | 0.018 |
| Giant F-waves (%) | 13.41 ± 19.28 | 9.10 ± 21.32 | 0.91 ± 2.94 | 0.004 | 0.012 | >0.05 | 0.015 |
| Frequency of Patients with giant F-waves | 19/38 | 10/19 | 3/27 | 0.001 | 0.002 | 0.851 | 0.002 |
SCA3, spinocerebellar ataxia type 3; PreSCA3, preclinical carriers of the SCA3 gene mutation; NA, not applicable. Values are mean ± SD. Values with significant differences printed in bold characters.