Table 3.
MANOVA of nerve conduction parameters across categories of CTS severity in the GEHS classification system (A) and consolidated GEHS classification (B).
| (A) GEHS | ||||||||
|---|---|---|---|---|---|---|---|---|
| CTS Severity | N | Category Comparison | DSL1 (ms) | Mean Δ | p value | DSL3 (ms) | Mean Δ | p value |
| Normal | 134 | 2.56 ± 0.23 | 3.20 ± 0.22 | |||||
| V Mild | 13 | V Mild v Normal | 3.05 ± 0.19 | 0.49 | 1.00 | 3.45 ± 0.22 | 0.25 | 1.00 |
| Mild(s) | 100 | Mild(s) v V Mild | 3.05 ± 0.42 | -0.05 | 1.00 | 3.85 ± 0.62 | 0.41 | 1.00 |
| Mild(s/m) | 124 | Mild(s/m) v Mild(s) | 3.33 ± 0.73 | 0.28 | 1.00 | 4.13 ± 0.91 | 0.27 | 1.00 |
| Moderate | 230 | Mod v Mild(s/m) | 2.53 ± 2.04 | -0.80 | <.001 | 3.08 ± 2.58 | -1.04 | <.001 |
| Mod/Sev | 18 | Mod/Sev v Mod | 2.03 ± 2.23 | -0.50 | 1.00 | 3.64 ± 2.67 | 0.56 | 1.00 |
| Severe | 46 | Sev v Mod/Sev | 0.84 ± 1.97 | -1.19 | .500 | 0.95 ± 2.12 | -2.69 | <.001 |
| CTS Severity | N | Category Comparison | DML (ms) | Mean Δ | p value | DMA (mV) | Mean Δ | p value |
| Normal | 134 | 3.46 ± 0.34 | 9.05 ± 3.05 | |||||
| V Mild | 13 | V Mild v Normal | 3.75 ± 0.21 | 0.29 | 1.00 | 8.16 ± 3.03 | -0.89 | 1.00 |
| Mild(s) | 100 | Mild(s) v V Mild | 3.89 ± 0.30 | 0.13 | 1.00 | 8.19 ± 2.81 | 0.03 | 1.00 |
| Mild(s/m) | 124 | Mild(s/m) v Mild(s) | 4.61 ± 0.19 | 0.72 | .019 | 7.13 ± 2.49 | -1.06 | .073 |
| Moderate | 230 | Mod v Mild(s/m) | 6.33 ± 1.43 | 1.72 | <.001 | 5.57 ± 2.57 | -1.56 | <.001 |
| Mod/Sev | 18 | Mod/Sev v Mod | 6.42 ± 0.25 | 0.09 | 1.00 | 5.37 ± 2.59 | -0.20 | 1.00 |
| Severe | 46 | Sev v Mod/Sev | 4.57 ± 5.18 | -1.86 | <.001 | 1.72 ± 2.33 | -3.65 | <.001 |
| p<0.0083 for post hoc comparisons. | ||||||||
| (B) Consolidated GEHS | ||||||||
| CTS Severity | N | Category Comparison | DSL1 (ms) | Mean Δ | p value | DSL3 (ms) | Mean Δ | p value |
| Normal | 134 | 2.56 ± 0.23 | 3.20 ± 0.22 | |||||
| Mild | 113 | Mild v Norm | 3.19 ± 0.61 | 0.64 | <.001 | 3.97 ± 0.79 | 0.77 | <.001 |
| Moderate | 354 | Mod v Mild | 2.53 ± 2.04 | -0.67 | <.001 | 3.08 ± 2.58 | -0.89 | <.001 |
| Severe | 64 | Sev v Mod | 1.17 ± 2.09 | -1.36 | <.001 | 1.71 ± 2.57 | -1.37 | <.001 |
| CTS Severity | N | Category Comparison | DML (ms) | Mean Δ | p value | DMA (mV) | Mean Δ | p value |
| Normal | 138 | 3.46 ± 0.34 | 9.05 ± 3.05 | |||||
| Mild | 146 | Mild vs Norm | 4.26 ± 0.44 | 0.79 | <.001 | 7.63 ± 2.70 | -1.42 | <.001 |
| Moderate | 279 | Mod vs Mild | 6.33 ± 1.43 | 2.07 | <.001 | 5.57 ± 2.57 | -2.07 | <.001 |
| Severe | 102 | Sev vs Mod | 5.09 ± 4.46 | -1.24 | <.001 | 2.74 ± 2.90 | -2.82 | <.001 |
p<0.0167 for post hoc comparisons. DSL1: distal sensory latency to thumb; DSL3: distal sensory latency to middle finger; DML: distal motor latency; DMA: distal motor amplitude; V: Very; s: sensory only; s/m: sensory & motor; Norm: Normal; Mod: Moderate; Sev: Severe; ms: milliseconds; mV: millivolts.