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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