Table 2. Distribution of risk factors by gender and age group.

Age groups
	< 30 years		30–39 years		40–49 years		50–59 years		60–69 years		70–79 years		≥ 80 years
Risk factors	Men n (%)	Women n (%)	Men n (%)	Women n (%)	Men n (%)	Women n (%)	Men n (%)	Women n (%)	Men n (%)	Women n (%)	Men n (%)	Women n (%	Men n (%)	Women n (%)
Current tobacco use+	1 (9.1)	0 (0)	6 (19.4)	2 (4.7)	12 (27.9)	2 (3)	17 (33.3)	2 (3.2)	18 (27.7)	4 (5.6)	11 (20)	9 (16.4)	13 (35.1)	14 (21.2)
Diabetes mellitus*	1 (9.1)	0 (0)	1 (3.2)	4 (9.3)	2 (4.7)	8 (11.9)	3 (5.9)	4 (6.6)	19 (29.2)	21 (29.2)	14 (25.5)	9 (16.4)	6 (16.2)	11 (16.7)
Hypercholesterolaemia†	0 (0)	1 (3.1)	2 (6.5)	0 (0)	1 (2.3)	0 (0)	2 (3.9)	2 (3.2)	3 (4.6)	1 (1.4)	3 (5.5)	2 (3.6)	1 (2.7)	1 (1.5)
Hypertension‡	5 (45.5)	15 (46.9)	15 (48.4)	25 (59.5)	29 (69)	46 (69.7)	42 (82.4)	49 (79)	57 (87.7)	68 (94.4)	47 (85.5)	51 (92.7)	26 (70.3)	56 (84.8)
Oral contraceptives	0 (0)	6 (18.8)	0 (0)	12 (27.9)	0 (0)	8 (11.9)	0 (0)	0 (0)	0 (0)	1 (1.4)	0 (0)	0 (0)	0 (0)	0 (0)
Previous migraine	4 (36.4)	18 (56.3)	14 (45.2)	19 (44.2)	12 (27.9)	30 (44.8)	16 (31.4)	20 (32.3) 20 (32.3)	20 (30.8)	27 (37.5)	9 (16.4)	14 (25.5)	8 (21.6)	15 (22.7)
HIV infection	0 (0)	7 (21.9)	3 (9.7)	7 (16.3)	9 (20.9)	12 (17.9)	5 (9.8)	5 (8.1)	3 (4.6)	2 (2.8)	1 (1.8)	1 (1.8)	0 (0)	0 (0)
Cocaine use	0 (0)	0 (0)	1 (3.2)	1 (2.3)	0 (0)	1 (1.5)	1 (2)	0 (0)	0 (0)	1 (1.4)	0 (0)	0 (0)	0 (0)	0 (0)

+Cigarette smoking within the last five years. *Elevated fasting glucose level > 5.6 mmol/l or treatment of previously diagnosed diabetes. †High-density lipoprotein cholesterol < 1.3 mmol/l; triglycerides > 2.2 mmol/l; total cholesterol > 6.2 mmol/l; low-density lipoprotein cholesterol > 4.1 mmol/l, or specific treatment for this abnormality.‡Elevated blood pressure 140/90 mmHg or treatment of previously diagnosed hypertension.