Table 2.
MANOVA of nerve conduction parameters across categories of CTS severity in the Bland classification system (A) and consolidated Bland classification (B).
| (A) Bland | ||||||||
|---|---|---|---|---|---|---|---|---|
| CTS Severity | N | Category Comparison | DSL1 (ms) | Mean Δ | p value | DSL3 (ms) | Mean Δ | p value |
| Normal | 138 | 2.57 ± 0.23 | 3.20 ± 0.22 | |||||
| V Mild | 12 | V Mild v Norm | 3.06 ± 0.19 | 0.49 | 1.00 | 3.40 ± 0.15 | 0.19 | 1.00 |
| Mild | 134 | Mild v V Mild | 3.09 ± 0.49 | 0.04 | 1.00 | 3.82 ± 0.81 | 0.42 | 1.00 |
| Moderate | 241 | Mod v Mild | 3.51 ± 1.29 | 0.42 | .011 | 4.87 ± 0.80 | 1.05 | <.001 |
| Severe | 38 | Sev v Mod | 1.45 ± 2.05 | -2.06 | <.001 | 0.00 ± 0.00 | -4.87 | <.001 |
| V Severe | 78 | V Sev v Sev | 0.61 ± 1.57 | -0.84 | .003 | 0.00 ± 0.00 | 0.00 | 1.00 |
| E Severe | 24 | E Sev v V Sev | 0.17 ± 0.84 | -0.43 | 1.00 | 0.85 ± 1.95 | 0.85 | <.001 |
| CTS Severity | N | Category Comparison | DML (ms) | Mean Δ | p value | DMA (mV) | Mean Δ | p value |
| Normal | 138 | 3.49 ± 0.37 | 8.94 ± 3.08 | |||||
| V Mild | 12 | V Mild v Norm | 3.75 ± 0.22 | 0.26 | 1.00 | 8.58 ± 2.73 | -0.36 | 1.00 |
| Mild | 134 | Mild v V Mild | 4.00 ± 0.34 | 0.26 | 1.00 | 8.05 ± 2.75 | -0.53 | 1.00 |
| Moderate | 241 | Mod v Mild | 5.45 ± 0.85 | 1.44 | <.001 | 6.34 ± 2.52 | -1.71 | <.001 |
| Severe | 38 | Sev v Mod | 5.44 ± 0.51 | -0.02 | <.001 | 5.59 ± 2.83 | -0.74 | 1.00 |
| V Severe | 78 | V Sev v Sev | 8.58 ± 1.96 | 3.15 | 1.00 | 4.12 ± 2.22 | -1.47 | .104 |
| E Severe | 24 | E Sev v V Sev | 0.00 ± 0.00 | -8.58 | <.001 | 0.00 ± 0.00 | -4.12 | <.001 |
| p<0.0083 for post hoc comparisons. | ||||||||
| (B) Consolidated Bland | ||||||||
| CTS Category | N | Category Comparison | DSL1 (ms) | Mean Δ | p value | DSL3 (ms) | Mean Δ | p value |
| Normal | 138 | 2.57 ± 0.23 | 3.20 ± 0.22 | |||||
| Mild | 146 | Mild v Norm | 3.09 ± 0.47 | 0.53 | .001 | 3.79 ± 0.79 | 0.59 | <.001 |
| Moderate | 241 | Mod v Mild | 3.51 ± 1.29 | 0.42 | .002 | 4.87 ± 0.80 | 1.08 | <.001 |
| Severe | 140 | Sev v Mod | 0.76 ± 1.67 | -2.75 | <.001 | 0.15 ± 0.86 | -4.72 | <.001 |
| CTS Category | N | Category Comparison | DML (ms) | Mean Δ | p value | DMA (mV) | Mean Δ | p value |
| Normal | 138 | 3.49 ± 0.37 | 8.94 ± 3.08 | |||||
| Mild | 146 | Mild v Norm | 3.99 ± 0.34 | 0.49 | .082 | 8.09 ± 2.74 | -0.84 | .063 |
| Moderate | 241 | Mod v Mild | 5.45 ± 0.85 | 1.47 | <.001 | 6.34 ± 2.52 | -1.76 | <.001 |
| Severe | 140 | Sev v Mod | 6.26 ± 3.49 | 0.81 | <.001 | 3.82 ± 2.88 | -2.52 | <.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; E: Extremely; Norm: Normal; Mod: Moderate; Sev: Severe; Ext: Extreme; ms: milliseconds; mV: millivolts.