Table 6.

Hazard ratios (with 95% confidence intervals) and numbers of cases for stroke by category of birth weight and body mass index at age 18 years, adjusted for age and updated smoking status, nurses' health study, 1976-2000

	Age 18 BMI centile
Birth weight in kg (centile)	<11th	11-42nd	43rd-87th	≥87th	Hazard ratio per unit BMI
<2.50 (<11th)	1.86 (16)	0.95 (17)	1.48 (38)	2.20 (16)	1.08 (1.01 to 1.17)
2.50≤3.18 (11th≤42nd)	1.28 (47)	1.29 (115)	1.05 (125)	1.50 (47)	1.03 (0.99 to 1.07)
3.19≤3.86 (43rd≤87th)	0.89 (33)	1.14 (143)	1.00 (ref) (196)	1.28 (82)	1.02 (0.99 to 1.05)
≤3.87 (≥87th)	1.06 (13)	0.84 (33)	0.93 (58)	1.29 (36)	1.04 (1.00 to 1.09)
Hazard ratio per kg birth weight	0.69 (0.48 to 1.02)	0.89 (0.72 to 1.10)	0.83 (0.70 to 0.99)	0.86 (0.66 to 1.11)	—

BMI=body mass index.