Association between blood coagulability and migraine

Table 5 Correlation between age, disease duration, headache frequency and headache intensity with serum level of protein C, protein S and anti-thrombin III

Variables	Protein C (IU/dl)		Protein S (IU/dl)		Anti-thrombin III (IU/dl)
Variables	Correlation coefficient (R)	p value	Correlation coefficient (R)	p value	Correlation coefficient (R)	p value
Age	0.289	0.092	− 0.247	0.153	0.206	0.235
Disease duration	0.038	0.828	− 0.200	0.249	0.057	0.746
Headache frequency	0.239	0.167	− 0.218	0.208	− 0.120	0.494
Headache intensity	0.399	0.017*	− 0.067	0.701	0.269	0.118