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Table 1 Physical characteristics of the subjects

From: Validity of ultrasound muscle thickness measurements for predicting leg skeletal muscle mass in healthy Japanese middle-aged and older individuals

Variables

Model-development group (n = 52)

Cross-validation group (n = 25)

Men ( n = 22)

Women (n = 30)

Men (n = 11)

Women (n = 14)

Age, years

62.1 ± 8.6

66.3 ± 5.9

67.5 ± 4.9

63.7 ± 7.7

Height, cm

166.5 ± 5.6

153.5 ± 4.1

166.5 ± 5.6

154.5 ± 3.0

Body mass, kg

65.0 ± 7.3

50.3 ± 5.8

67.0 ± 6.5

53.1 ± 4.9

Body mass index, kg/m2

23.4 ± 2.1

21.4 ± 2.5

24.2 ± 2.5

22.2 ± 1.7

Limb length, cm

    

  Thigh

37.8 ± 1.9

34.8 ± 1.5

37.9 ± 2.0

34.9 ± 1.5

  Lower leg

37.0 ± 2.0

34.2 ± 1.7

37.1 ± 2.2

34.1 ± 1.6

MT measurements, cm

    

  Thigh anterior

4.77 ± 0.53

3.84 ± 0.59

4.56 ± 0.64

3.90 ± 0.57

  Thigh posterior

6.12 ± 0.60

4.85 ± 0.48

6.29 ± 0.46

4.98 ± 0.40

  Lower leg anterior

3.09 ± 0.24

2.56 ± 0.17

3.05 ± 0.26

2.72 ± 0.28

  Lower leg posterior

6.91 ± 0.38

5.75 ± 0.37

6.99 ± 0.61

5.72 ± 0.39

DXA measurements total body

    

  FM, kg

12.1 ± 3.7

13.8 ± 3.7

13.1 ± 2.5

16.4 ± 2.8

  LTM, kg

51.5 ± 4.7

35.7 ± 3.0

52.4 ± 4.9

35.6 ± 2.7

  BMC, kg

2.2 ± 0.3

1.5 ± 0.2

2.2 ± 0.3

1.6 ± 0.3

  %FM, %

18.2 ± 3.9

26.7 ± 5.0

19.2 ± 2.8

30.4 ± 3.3

Right leg

    

  FM, kg

1.8 ± 0.6

2.5 ± 0.6

2.0 ± 0.6

3.1 ± 0.7

  LTM, kg

8.7 ± 1.2

5.8 ± 0.6

8.7 ± 0.9

6.0 ± 0.6

  1. Values are means ± SDs; thigh length, distance between the lateral condyle of the femur and the greater trochanter; lower leg length, distance between the lateral malleous of the fibula and the lateral condyle of the tibia. BMC, bone mineral content; FM, fat mass; LTM, bone-free lean tissue mass;. MT, muscle thickness; %FM, the percentage of FM in the total mass.