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Table 2 Onset of knee pain at three years among people aged 50 and over with no knee pain at baseline by body mass index (BMI) category.

From: Disabling knee pain – another consequence of obesity: Results from a prospective cohort study

BMI category at baseline   Knee Pain at 3 years Unadjusted analysis Adjusted analysisa
  n n (%) Relative Risk (RR) (95% Confidence Interval (CI)) RRb (95% CI) Potential cases avoidedc (% of all incident cases) RR (95% CI) RRb (95% CI) Potential cases avoidedc (% of all incident cases)
Normald 960 216 (22.5) 1.00 - - 1.00 - -
Overweight 809 196 (24.2) 1.08 (0.91, 1.28) 1.00 14 (2.9) 1.08 (0.89, 1.32) 1.00 15 (3.1)
Obese 227 71 (31.3) 1.39 (1.11, 1.74) 1.29 (1.03, 1.62) 16 (3.3) 1.26 (0.95, 1.67) 1.17 (0.88, 1.56) 10 (2.1)
Total 1996 483 (24.2)    30 (6.2)    25 (5.2)
  1. a adjusted for age, gender, deprivation, anxiety, depression, previous knee injury, widespread pain measured at baseline
  2. b obesity category compared to overweight
  3. c number of cases which could have been avoided by reducing overweight people to normal and obese people to overweight
  4. d Normal weight category includes individuals who were underweight.