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Table 1 Characteristics of the Wuchuan County OA Study participants

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

  No knee pain
(n= 514)
Knee pain
(n= 404)
Symptomatic knee OAa
(n= 109)
P
Age, years; mean (SD) 57.3 (7.8) 56.2 (7.4) 62.7 (8.9) < 0.001
Female 45% 54% 68% < 0.001
BMI (kg/m2), mean (SD) 22.0 (3.1) 22.5 (3.1) 24.0 (4.0) < 0.001
Back pain 29% 51% 43% < 0.001
< 7 years' education 74% 72% 84% 0.04
Occupation, farming 93% 90% 83% 0.002
Still working 86% 89% 67% < 0.001
SF-12 PCS, mean (SD) 49.9 (6.2) 49.9 (6.8) 49.3 (6.8) 0.7
SF-12 MCS, mean (SD) 52.3 (6.1) 53.4 (5.7) 54.6 (7.1) 0.004
  1. aRadiographic OA in a painful knee. MCS, Mental Component Summary Score; PCS, Physical Component Summary Score.