Table 3.
Subgroup Analysis of Sonographic and Clinical Parameters According to the Electrodiagnostic Severity Grades
| Variable | Group | Severity Grade | |||
|---|---|---|---|---|---|
| S1 | S2 | S3 | S4 | ||
| CSA, mm2 | NMN | 13.0 (11.0−15.0) | 13.0 (12.0−14.0) | 14.0 (13.0−16.5) | 17.0 (15.0−20.0) |
| BMN | 15.0 (12.5−18.0) | 15.5 (12.5−20.0) | 17.0 (15.5−20.0) | 17.0 (16.0−20.0) | |
| P-value | 0.001 | 0.063 | 0.010 | 0.989 | |
| PB, mm | NMN | 1.9 (1.4−2.5) | 1.8 (1.4−2.6) | 2.3 (1.7−3.0) | 2.8 (2.2−3.6) |
| BMN | 2.0 (1.6−3.0) | 2.0 (1.4−2.8) | 2.3 (1.8−2.8) | 3.0 (1.9−3.7) | |
| P-value | 0.313 | 0.867 | 0.847 | 0.929 | |
| NRS | NMN | 3.0 (2.0−4.0) | 3.0 (3.0−4.0) | 5.0 (3.0−5.0) | 5.0 (5.0−7.0) |
| BMN | 5.0 (4.0−5.5) | 5.0 (5.0−5.0) | 7.0 (6.0−7.0) | 7.0 (6.0−8.0) | |
| P-value | <0.001 | 0.002 | <0.001 | 0.010 | |
| SD, months | NMN | 2.0 (1.0−4.0) | 3.0 (1.0−4.0) | 4.0 (2.0−9.0) | 12.0 (6.0−15.0) |
| BMN | 3.0 (2.0−5.0) | 8.0 (2.5−18.0) | 10.0 (5.5−12.0) | 19.0 (12.0−36.0) | |
| P-value | 0.037 | 0.061 | 0.059 | 0.034 | |
Note: All continuous values are expressed as median (interquartile range).
Abbreviations: CSA, cross-sectional area; PB, palmar bowing; NRS, numerical pain rating scale; SD, symptom duration; NMN, non-bifid median nerve; BMN, bifid median nerve.