Table 3.
The proportions of positive items in the LANSS questionnaire among patients with vitamin C concentrations ≥ the cutoff value vs. < the cutoff value.
| Cutoff for Plasma Vitamin C Concentrations | ≥7.05 mg/L (n = 47) | <7.05 mg/L (n = 73) | p | ≥5.68 mg/L (n = 57) | <5.68 mg/L (n = 63) | p |
|---|---|---|---|---|---|---|
| Tingling, prickling or pins and needles sensations, n (%) | 29 (61.7) | 71 (97.3) | <0.001 | 44 (74.6) | 59 (96.7) | <0.001 |
| A different skin aspect in the painful areas, n (%) | 26 (55.3) | 51 (69.9) | 0.105 | 34 (57.6) | 43 (70.5) | 0.142 |
| Abnormally sensitive to touch in the painful area, n (%) | 18 (38.3) | 36 (49.3) | 0.236 | 23 (39.0) | 31 (50.8) | 0.193 |
| Sudden electric shocks, bursting or jumping pain, n (%) | 24 (51.1) | 39 (48.9) | 0.800 | 32 (54.2) | 31 (50.8) | 0.708 |
| Burning pain, n (%) | 9 (19.1) | 22 (30.1) | 0.180 | 13 (22.0) | 18 (29.5) | 0.350 |
| Allodynia in painful area, n (%) | 23 (48.9) | 45 (61.6) | 0.170 | 29 (49.2) | 39 (63.9) | 0.102 |
| Altered pin-prick threshold, n (%) | 20 (42.6) | 21 (28.8) | 0.120 | 24 (40.7) | 17 (27.9) | 0.139 |
n: number; LANSS: Leeds assessment of neuropathic symptoms and signs.