Table 1.
Basic characteristics of the study population.
| iSFN (n = 41) | sSFN (n = 44) | Sign. | |
|---|---|---|---|
| Sex (female) | 26 (41%) | 32 (73%) | p < 0.05 |
| Age (ys) | 51.4 ± 12.5 | 58.7 ± 10.9 | p = 0.05 |
| Onset (ys) | 47.6 ± 12.6 | 55.6 ± 11.1 | p < 0.05 |
| Duration (ys) | 3.9 ± 3.0 | 3.2 ± 2.9 | ns. |
| Distribution, LD/NLD (n, %) | 35/6 (85/15%) | 37/7 (84/16%) | ns. |
| Upper extremity involvement (n, %) | 26 (63%) | 26 (59%) | ns. |
| Numbness (n, %) | 34 (83%) | 35 (80%) | ns. |
| Burning pain (n, %) | 26 (63%) | 25 (57%) | ns. |
| Prickling pain (n, %) | 12 (29%) | 11 (25%) | ns. |
| Itching pain (n, %) | 5 (12%) | 3 (7%) | ns. |
| Allodynia (n, %) | 10 (24%) | 10 (23%) | ns. |
Although the ratio of females and the onset of the disease was significantly higher in the secondary SFN (sSFN) group, all other parameters were not statistically different from idiopathic SFN (iSFN). LD: length dependent; NLD: nonlength-dependent; ns.: nonsignificant.