Table 4 Comparison of EMG parameters between CMI patients with and without of cerebellar tonsillar herniation beyond C1.
Variable | Tonsillar herniation ≤ C1 (N1 = 15) | Tonsillar herniation > C1 (N3 = 25) | Χ2/Z/t | p value |
|---|---|---|---|---|
Sex | 0.673 | 0.412 | ||
Female | 7 (46.70) | 15 (60.00) | ||
Male | 8 (53.30) | 10 (40.00) | ||
Age | 45.20 ± 9.25 | 46.28 ± 11.51 | − 0.308 | 0.76 |
Average latency (ms) (R) | 11.50 (10.10, 12.80) | 11.70 (10.45, 12.95) | − 0.447 | 0.655 |
Average latency (ms) (L) | 11.72 ± 1.57 | 12.20 ± 1.79 | − 0.865 | 0.393 |
Average amplitude (uv) (R) | 364.00 (291.0, 469.00) | 379.00 (335.50, 431.5) | − 0.964 | 0.335 |
Average amplitude (uv) (L) | 331.00 (250.00, 468.00) | 372.00 (311.00, 417.00) | − 0.587 | 0.557 |
Polyphasic wave ratio % (R) | 9.00 (0.00, 20.00) | 7.10 (0.00, 12.40) | − 0.155 | 0.877 |
Polyphasic wave ratio % (L) | 7.50 (0.00, 18.80) | 5.60 (0.00, 10.25) | − 0.933 | 0.351 |
Polyphasic-adjusted average latency (R) | 11.28 ± 1.54 | 11.54 ± 1.64 | − 0.497 | 0.622 |
Polyphasic-adjusted average latency (L) | 11.32 ± 1.25 | 11.90 ± 1.95 | − 1.021 | 0.314 |
Amplitude mv (R) | 1.60 (1.20, 1.90) | 1.50 (1.10, 1.80) | − 1.236 | 0.216 |
Amplitude mv (L) | 1.58 ± 0.42 | 1.37 ± 0.43 | 1.53 | 0.134 |
Recruitment phase (R) | 0.86 | 0.354 | ||
0 | 7 (46.70) | 8 (32.00) | ||
1 | 8 (53.30) | 17 (68.00) | ||
Recruitment phase (L) | 1.143 | 0.285 | ||
0 | 6 (40) | 6 (24) | ||
1 | 9 (60) | 19 (76) | ||
Spontaneous abnormal potentials (R) | 0.027 | 0.87 | ||
0 | 8 (53.3) | 14 (56) | ||
1 | 7 (46.7) | 11 (44) | ||
Spontaneous abnormal potentials (L) | 3.259 | 0.071 | ||
0 | 11 (73.3) | 11 (44) | ||
1 | 4 (26.7) | 14 (56) |
