Table 2 Vitamin D levels according to clinical variables in the patients with cluster headache
From: Vitamin D deficiency in patients with cluster headache: a preliminary study
| Â | 25(OH)D, ng/mL | p-value |
|---|---|---|
Sex | Â | 0.646 |
 Men (n = 24) | 13.95 ± 4.08 |  |
 Women (n = 4) | 14.33 ± 2.82 |  |
Recurrence | Â | 0.300 |
 First episode (n = 6) | 14.83 ± 2.42 |  |
 Recurrent episode (n = 22) | 13.78 ± 4.21 |  |
Paired comparison | Â | 0.421 |
 Cluster period (n = 14) | 13.87 ± 3.64 |  |
 Remission period (n = 14) | 14.06 ± 4.56 |  |
Diurnal periodicity | Â | 0.728 |
 Present (n = 16) | 13.69 ± 3.47 |  |
 Absent (n = 12) | 14.41 ± 4.50 |  |
Time of propensity | Â | 0.125 |
 Nighttime propensity (n = 9) | 14.72 ± 3.63 |  |
 Daytime propensity (n = 7) | 11.71 ± 2.63 |  |
Recurrence at 3Â months | Â | 0.562 |
 present (n = 2) | 13.00 ± 3.39 |  |
 absent (n = 26) | 14.08 ± 3.97 |  |
Seasonal periodicity | Â | 0.188 |
 Present (n = 14) | 14.63 ± 4.14 |  |
 Absent (n = 8) | 12.29 ± 4.18 |  |
Season of cluster period | Â | 0.097 |
 Winter to spring (n = 7) | 12.30 ± 1.58 |  |
 Summer to autumn (n = 7) | 16.96 ± 4.69 |  |
Sampling season | Â | 0.001 |
 Winter to spring (n = 15) | 11.91 ± 2.63 |  |
 Summer to autumn (n = 13) | 16.41 ± 3.76 |  |