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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.