Table.

Use of oral contraceptives and prothrombotic disorders in cases (women with cerebral venous sinus thrombosis aged 18-54 years, puerperium excluded) and use of oral contraceptives in controls

Age (years)	Cases			Proportion (%) of controls taking contraceptives
	Proportion (%) taking contraceptives	No with factor V Leiden	No with C, S, or antithrombin deficiency
18-19	3/3 (100)	1	0	60/107 (56)
20-24	7/7 (100)	0	0	271/336 (81)
25-29	4/4 (100)	1	1	255/400 (64)
30-34	7/7 (100)	2	0	176/392 (45)
35-39	5/6 (83)	0	1	105/342 (31)
40-44	3/5 (60)	0	0	79/336 (24)
45-49	4/5 (80)	0	0	61/335 (18)
50-54	1/3 (33)	1	0	No data
Total	34/40 (85)	5*	2†	1007/2248 (45)

^*Data missing for four women.  

^†Data missing for three women.