Table 3.

 Association between peripartum migraine and vascular diagnoses or cardiovascular risk factors

Vascular diagnosis or risk factor	ICD-9 codes	Migraine rate per 100 000*	Odds ratio (95% CI)	P value
All strokes	430, 431, 434, 436, 325, 674.0	2839	15.8 (11.1 to 22.5)	<0.001
Ischaemic stroke	434, 436	5364	30.7 (17.4 to 34.1)	<0.001
Intracerebral haemorrhage	431	1653	9.1 (3.0 to 27.8)	<0.001
Cerebral venous thrombosis	325	0	–	–
Subarachnoid haemorrhage	430	615	3.4 (0.5 to 24.1)	0.23
Pregnancy related cerebrovascular event	674	2546	14.1 (8.7 to 23.1)	<0.001
Myocardial infarction	410	1771	4.9 (1.7 to 14.2)	<0.001
Heart disease	648.5, 648.6	410	2.1 (1.8 to 2.6)	<0.001
Pulmonary embolus	673.2, 415.1	760	3.1 (1.7 to 5.6)	<0.001
Deep venous thrombosis	671.3, 451.1, 451.2	515	2.4 (1.3 to 4.2)	<0.001
Thrombophilia	282.62, 282.42, 282.64	781	3.6 (2.1 to 6.1)	<0.001
Hypertension	401-405	740	3.6 (3.1 to 4.2)	<0.001
Cardiomyopathy	425	636	2.2 (1.3 to 3.7)	<0.001
Diabetes	648.0, 250	482	2.3 (1.9 to 2.7)	<0.001
Smoking	305.1, V15.82	489	2.7 (2.4 to 3.1)	<0.001

ICD-9= international classification of diseases, 9th revision.

*Migraine rate per 100 000 discharges for each vascular diagnosis or risk factor.