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Table 2 Self-reported physical disability

From: Marked disability and high use of nonsteroidal antiinflammatory drugs associated with knee osteoarthritis in rural China: a cross-sectional population-based survey

Outcome n "With difficulty"a OR (95% CI)
[P]b
Walk for 2 li (1 km)    
No knee pain 514 22% 1
Knee pain 402 37% 1.9 (1.4 to 2.7)
Knee OA 109 60% 3.2 (2.0 to 5.2)
    [P = 0.04]
Up 10 steps without resting    
No knee pain 491 30% 1
Knee pain 387 64% 4.0 (3.0 to 5.5)
Knee OA 104 78% 5.5 (3.3 to 9.8)
    [P = 0.27]
Stooping, crouching, kneeling    
No knee pain 514 33% 1
Knee pain 404 70% 4.2 (3.1 to 5.8)
Knee OA 109 90% 14.5 (7.5 to 31.0)
    [P < 0.001]
House-cleaning chores    
No knee pain 514 7% 1
Knee pain 404 14% 1.8 (1.1 to 2.8)
Knee OA 109 25% 2.2 (1.2 to 4.0)
    [P = 0.48]
Preparing meals    
No knee pain 449 5% 1
Knee pain 368 11% 2.2 (1.3 to 4.0)
Knee OA 102 20% 2.5 (1.2 to 5.1)
    [P = 0.70]
  1. PCS, Physical Component Summary Score, adjusted for age, gender, BMI, self-reported back pain and years of education. aReporting "some difficulty," "much difficulty," or "unable to do." b[P] Difference knee pain versus knee OA.