Table 4.

Multivariate logistic regression model – factors associated with IWPH among those with episodic migraine

Variable		Odds ratio	95% IC	P
Gender (female versus male)		3.47	1.17-10.3	0.025
Age at onset migraine (year)
	15-19 vs. less than 15	0.56	0.23-1.38	0.3
	20-24 vs. less than 15	0.59	0.22-1.62	0.31
	25-29 vs. less than 15	1.38	0.38-4.98	0.63
	30 or more vs. less than 15	0.242	0.09-0.66	0.005
Migraine frequency (attacks per year)
	7-12 vs. 1-6	1.58	0.46-5.48	0.47
	13-54 vs. 1-6	2.06	0.72- 5.89	0.18
	more than 54 vs. 1-6	8.75	2.34-32.7	0.001

Independent variables with P < 0.15 on univariate analysis were introduced into the model: female gender, current age, age at migraine onset, frequency of headache, headache disability, cutaneous allodynia, phonophobia, depression and use of prophylactic medicine