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Table 1 Subject characteristics

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

  Overall Men Women P values
N 2152 690 1462  
Age, years 71.6 ± 12.2 72.5 ± 12.3 71.2 ± 12.1 0.0164
Height, cm 154.3 ± 9.2 163.1 ± 7.1 150.1 ± 6.8 <0.0001
Weight, kg 54.3 ± 10.7 61.6 ± 11.0 50.9 ± 8.6 <0.0001
BMI, kg/m2 22.7 ± 3.4 23.1 ± 3.3 22.5 ± 3.5 0.0009
Right     
 Grip strength 28.1 ± 9.6 37.2 ± 9.4 23.7 ± 5.8 <0.0001
 Quadriceps muscle strength, kgf 28.1 ± 11.2 31.9 ± 12.7 26.2 ± 10.0 <0.0001
 Weight bearing index 0.52 ± 0.20 0.52 ± 0.20 0.52 ± 0.20 0.8724
 Lower limb muscle mass, kg 6.3 ± 1.6 7.9 ± 1.5 5.5 ± 0.8 <0.0001
 Lower limb muscle mass/height2, kg/m2 2.6 ± 0.4 3.0 ± 0.4 2.4 ± 0.3 <0.0001
 Knee OA (%) 44.1 31 50.3 <0.0001
 Knee pain (%) 20.6 15.1 23.3 <0.0001
Left     
 Grip strength 26.2 ± 9.4 35.2 ± 9.1 22.0 ± 5.9 <0.0001
 Quadriceps muscle strength, kgf 26.9 ± 11.2 30.6 ± 12.6 25.1 ± 9.9 <0.0001
 Weight bearing index 0.50 ± 0.20 0.50 ± 0.20 0.50 ± 0.20 0.9715
 Lower limb muscle mass, kg 6.2 ± 1.6 7.8 ± 1.5 5.4 ± 0.8 <0.0001
 Lower limb muscle mass/height2, kg/m2 2.6 ± 0.4 2.9 ± 0.4 2.4 ± 0.3 <0.0001
 Knee OA (%) 45.2 33 51 <0.0001
 Knee pain (%) 20 13.9 22.9 <0.0001
  1. Except where indicated otherwise, values are means ± SD
  2. Knee OA was defined as Kellgren-Lawrence grade 2 or worse
  3. Weight bearing index was calculated as quadriceps muscle strength by weight
  4. Differences between men and women were determined by non-paired student t test except for prevalence of knee OA and knee pain
  5. Differences in prevalence of knee OA and knee pain between men and women were determined by chi-square test
  6. BMI Body mass index, OA Osteoarthritis