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. 2019 Aug 20;12:2529–2536. doi: 10.2147/JPR.S216314

Table 8.

Correlation between 25(OH)-vitamin D serum level and clinical characteristics of migraine

25 (OH)-vitamin D in ng/mL
(r) coefficient P-value
Attack duration in hours −0.552 ˂0.001*
Frequency of the attacks/month −0.629 ˂0.001*
MIGSEV scale Intensity −0.497 0.001*
Disability −0.427 0.006*
Tolerability −0.441 0.004*
Nausea −0.272 0.089
Total score −0.492 0.001*
HIT-6 scale −0.506 0.001*

Notes: (r) using Pearson coefficient, P-value≥0.05 (non significant), *P-value<0.05 (significant).

Abbreviations: MIGSEV, migraine severity; HIT-6, The Headache Impact Test-6.