Table 1.

Clinical details of MOH patients at baseline

	Total group	R-group	NR-group	Test statistics	p-value
Patients (n)	120	68 (56.7 %)	52 (43.3 %)	\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$$ \chi^{2} = 2.13 $$\end{document}	0.1441
Males (n) Females (n)	38 (31.7 %) 82 (68.3 %)	24 (35.3 %) 44 (64.7 %)	14 (26.9 %) 38 (73.1 %)	\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$$ \chi^{2} = 0.95 $$\end{document}	0.3286
Age (years)	49 (42–56)	50.5 (44–55)	50 (39–54)	\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$$ \chi^{2} = 1.22 $$\end{document}	0.2690
Marital status
Married	67 (55.8 %)	37 (54.4 %)	30 (57.7 %)	\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$$ \chi^{2} = 0.44 $$\end{document}	0.9312
Unmarried	39 (32.5 %)	22 (32.4 %)	17 (32.7 %)
Divorced	11 (9.2 %)	7 (10.3 %)	4 (7.7 %)
Widowed	3 (2.5 %)	2 (2.9 %)	1 (1.9 %)
Education
Primary school	21 (17.5 %)	12 (17.6 %)	9 (17.3 %)	\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$$ \chi^{2} = 0.36 $$\end{document}	0.9484
Secondary school	38 (31.7 %)	22 (32.4 %)	16 (30.8 %)
High school	37 (30.8 %)	20 (29.4 %)	17 (32.7 %)
University degree	24 (20.0 %)	14 (20.6 %)	10 (19.2 %)
Age at headache onset (years)	24 (19–26.5)	23.5 (18–26.5)	24 (19–26.5)	t = 1.46	0.1381
Duration of chronic pain (years)	16.4 ± 4.4	15.9 ± 4.2	17.1 ± 4.6	t = 1.55	0.1252
Number of days with pain/month	23.6 ± 4.7	22.9 ± 4.3	24.3 ± 5.1	t = 1.18	0.2397
VAS score	77.6 ± 20.8	78.5 ± 19.9	76.7 ± 21.7	t = 1.19	0.2659

Continuous variables are expressed as mean ± SD, except for age and age at headache onset (median and interquartile range). For age and age of headache onset variables Kruskal–Wallis test was used and relative Chi square values are reported. For the other continuous variable t test was used. Percentages between groups were compared by the Chi square test