Table 2

Relative risks (95% CI) for men and women at different ages, with medium and high BMI compared with those with low BMI, to develop knee osteoarthrosis. The relative risks are controlled for potential confounding from age, smoking, physical load, sports and hormone substitution

	30 years^2-150	40 years^†	50 years^‡
Men
medium exposure	2.0 (CI 1.2, 3.2)	2.2 (CI 1.4, 3.7)	3.4 (CI 1.8, 6.3)
% exposed cases	35	36	33
high exposure	3.9 (CI 2.4, 6.3)	3.9 (CI 2.3, 6.4)	5.9 (CI 3.1, 11.1)
% exposed cases	46	44	45
Women
medium exposure	1.9 (CI 1.1, 3.1)	3.0 (CI 1.7, 5.3)	2.8 (CI 17, 4.8)
% exposed cases	28	22	40
high exposure	5.8 (CI 3.5, 9.7)	9.2 (CI 5.3, 16.0)	7.8 (CI 4.6, 13.3)
% exposed cases	51	57	54

↵2-150 BMI men low –21, medium 22–23, high 24– women low –20, medium 21–22, high 23–. ^†BMI men low–22, medium 23–24, high 25– women low–21, medium 22–23, high 24–. ^‡BMI men low–23, medium 24–25, high 26– women low–22, medium 23–25, high 26–.