Prevalence of medication overuse headache in an interdisciplinary pain clinic

Table 4 Associated factors with chronification of headache

	p-value	p-value after Bonferroni correction	Odds ratio [95% CI]	Odds ratio after multipl. log. regression
Age Age + 10 years	0.09	0.703	–
Sex male/ female	0.86	1.000	–
Duration of pain disorder	0.76	1.000	–
History of migration	0.0015	0.012	3.29 [1.51,7.36]	2.89 [1.13,5.44]
History of headache	0.0016	0.013	3.31 [1.51,7.46]	2.48 [1.31,6.32]
Accident	0.70	1.000	–
Depression	0.0002	0.002	4.51 [1.85,12.25]	3.52 [1.46,8.52]
Anxiety	0.79	1.000	–

Table 4 shows results of the univariate analysis of different factors. P-values and p-values after bonferroni correction are listed. Odds ratios and the 95% confidence interval are calculated only when p-values were significant. Also, odds ratios after multiple log. Regression are listed for age + 10 years, migration, history of headache or depression.

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