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Table 5 Relative risks* for KR due to primary OA at different levels of BMI and physical activity at work

From: Risk factors for knee replacement due to primary osteoarthritis, a population based, prospective cohort study of 315,495 individuals

Physical activity at work
Body mass index, kg/m2 Sedentary Moderate Intermediate Intensive
Men  
<23.3 1 1.2 (0.5-2.9) 1.2 (0.4-3.3) 1.9 (0.7-5.3)
23.4-25.1 2.0 (0.9-4.2) 2.6 (1.2-5.4) 3.5 (1.6-7.6) 5.1 (2.4-11.3)
25.2-27.2 1.2 (0.5-2.8) 4.1 (2.1-8.3) 3.7 (1.7-7.8) 5.6 (2.7-12.0)
> = 27.3 5.9 (3.0-11.4)) 7.3 (3.7-14.2) 8.1 (4.1-16.2) 11.7 (5.9-23.1)
Women  
<21.6 1 0.6 (0.3-1.3) 0.8 (0.3-2.3) 3.1 (0.7-13.8)
21.7-23.5 1.4 (0.7-2.8) 1.7 (0.9-3.1) 1.3 (0.5-3.0) 2,6 (0.6-11.3)
23.6-26.1 2.8 (1.5-5.2) 3.2 (1.8-5.6) 3.1 (1.6-6.0) 7.9 (3.5-17.7)
> = 26.2 7.2 (4.1-12.8) 9.0 (5.2-15.7) 10.6 (5.9-18.8) 15.8 (8.2-30.3)
  1. *Adjusted for Age at screening, height, smoking habits, and physical activity at leisure (95% CI).