Table 2.

Factors associated with serum vitamin D deficiency by univariate analyses

Variable	B	SE (B)	OR (95% CI)	P
Age	0.023	0.012	1.123 (0.998-1.048)	0.042
Gender	0.328	0.441	1.389 (0.586-3.294)	0.456
Education	0.028	0.053	1.029 (0.927-1.142)	0.596
BMI	-0.053	0.051	0.948 (0.858-1.047)	0.295
Sunlight exposure, less than 1 hour
Versus 1 hour to less than 8 hours	0.020	0.510	1.020 (0.375-2.773)	0.968
Versus 8 hours or more	-0.018	0.504	0.982 (0.365-2.639)	0.972
Date of blood sampling	0.506	0.322	1.659 (0.882-3.120)	0.116
Migraine type	0.643	0.630	1.901 (0.553-6.540)	0.308
CM	1.252	0.378	3.496 (1.666-7.336)	0.001
MOH	0.511	0.634	1.667 (0.481-5.774)	0.420
Age at onset	0.022	0.013	1.022 (0.996-1.049)	0.091
Duration of migraine	0.010	0.017	1.010 (0.976-1.044)	0.570
Nausea/vomiting	0.268	0.412	1.308 (0.584-2.930)	0.515
Photophobia	0.033	0.316	1.034 (0.556-1.922)	0.916
Phonophobia	-0.090	0.330	0.914 (0.479-1.745)	0.785
Osmophobia	0.303	0.320	1.354 (0.723-2.535)	0.343
VAS	0.038	0.072	1.039 (0.902-1.197)	0.595
MIDAS	-0.009	0.007	0.991 (0.978-1.004)	0.175
Depression	0.557	0.369	1.746 (0.846-3.601)	0.131
Anxiety	0.938	0.393	2.554 (1.182-5.520)	0.017
Insomnia	0.630	0.502	1.877 (0.702-5.017)	0.209
Fatigue	0.692	0.320	1.997 (1.067-3.736)	0.030

BMI=Body Mass Index; CM=chronic migraine; MOH=medication overuse headache; VAS=Visual Analog Scale; MIDAS=Migraine Disability Assessment Scale