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Table 3 Association of age, BMI, gender, muscle strength and severity of knee OA with knee pain

From: Quadriceps muscle strength, radiographic knee osteoarthritis and knee pain: the ROAD study

  Right knee Left knee
  Adjusted OR 95 % CI P values Adjusted OR 95 % CI P values
Overall       
 Age 1.01 0.996–1.02 0.1698 1.00 0.99–1.02 0.6107
 BMI 1.09 1.06–1.13 <0.0001 1.09 1.06–1.13 <0.0001
 Women (vs Men) 1.34 1.03–1.76 0.0299 1.35 1.03–1.78 0.0321
 Quadriceps muscle strength (5kgf increase) 0.87 0.82–0.92 <0.0001 0.88 0.82–0.93 <0.0001
 KL 2 1.3 0.96–1.75 0.0929 1.54 1.12–2.12 0.0083
 KL 3 or 4 3.77 2.79–5.10 <0.0001 4.49 3.31–6.10 <0.0001
Men       
 Age 1.01 0.99–1.04 0.3309 1.01 0.99–1.04 0.3269
 BMI 1.09 1.02–1.17 0.013 1.09 1.02–1.18 0.0152
 Quadriceps muscle strength (5 kgf increase) 0.85 0.76–0.94 0.0019 0.86 0.77–0.96 0.0087
 KL 2 1.06 0.54–2.16 0.8753 1.18 0.60–2.21 0.624
 KL 3 or 4 5.98 3.42–10.54 <0.0001 4.99 2.79–8.93 <0.0001
Women       
 Age 1.01 0.99–1.02 0.2416 1.00 9.99–1.02 0.945
 BMI 1.09 1.05–1.14 <0.0001 1.09 1.05–1.14 <0.0001
 Quadriceps muscle strength (5 kgf increase) 0.88 0.82–0.95 0.0007 0.89 0.82–0.96 0.003
 KL 2 1.33 0.95–1.89 0.1007 1.67 1.15–2.44 0.0068
 KL 3 or 4 3.24 2.28–4.64 <0.0001 3.37 3.12–6.44 <0.0001
  1. Adjusted OR was calculated by multiple logistic regression analysis with age, BMI, gender, Quadriceps muscle strength and KL grade as explanatory variables
  2. OR Odds ratio, CI Confidence interval, BMI, Body mass index