Table 4. Headache related factors relationship to Frequency, Severity and Duration of headache attacks.

Variables	Frequency Attack Modeling		Severity Attack Modeling		Duration Attack Modeling
					Under 12 hours			Over 12 hours
	OR (95%CI)	P value	OR (95%CI)	P value	Coef.	SD	P value	Coef.	SD	P value
Headache duration in years	1.01 (1.01, 1.02)	0.003	1.02 (1.01, 1.05)	0.025	0.01	0.02	0.461	-0.03	0.01	0.030
Family history of headaches	1.08 (0.97, 1.20)	0.179	1.09 (0.86, 1.45)	0.341	0.94	0.27	0.731	-0.65	0.19	0.734
Vomiting	1.10 (0.97, 1.24)	0.128	1.48 (1.06, 2.06)	0.022	0.43	0.17	0.013	0.17	0.10	0.089
Nausea	1.69 (0.95, 1.19)	0.246	1.71 (1.27, 2.31)	0.001	0.17	0.24	0.486	-0.05	0.10	0.601
Pulsatile	0.97 (0.86, 1.11)	0.724	1.21 (0.86, 1.71)	0.278	0.13	0.23	0.585	0.32	0.23	0.176
Lateralization
Bilateral	1.00		1.00
Unilateral	1.26 (1.13, 1.41)	0.001	0.06 (0.78, 1.43)	0.720	0.29	0.18	0.106	0.12	0.19	0.503
Type of headache onset
Gradually	1.00		1.00
Suddenly	0.86 (0.76, 0.96)	0.005	1.06 (0.79, 1.42)	0.696	0.34	0.88	0.654	-0.09	0.16	0.560
Photophobia	1.08 (0.97, 1.21)	0.151	1.52 (1.15, 2.02)	0.004	0.03	0.19	0.872	-0.28	0.20	0.155
Phonophobia	1.07 (0.95, 1.20)	0.252	1.53 (1.12, 2.09)	0.009	0.13	0.21	0.519	0.09	0.22	0.692