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Table 1 Baseline characteristics of the study population and the young adults

From: Diagnosing sarcopenia and myosteatosis based on chest computed tomography images in healthy Chinese adults

  Whole Study Population Young reference group
Men (n = 359) Women (n = 210) p Men (n = 142) Women (n = 102) p
Age (years) 43.15 ± 10.67 41.47 ± 11.03 0.0736 32.8 ± 5.0 31.9 ± 4.8 0.1743
Smoking status (%)       
Never 167 (46.52%) 202 (96.19%)  < 0.0001 73 (51.41%) 96 (94.12%) Fisher < 0.0001
Ex-smokers 22 (6.13%) 0 (0.00%)   4 (2.82%) 0 (0.00%)  
Current smokers 163 (45.40%) 7 (3.33%)   64 (45.07%) 6 (5.88%)  
Miss 7 (1.95%) 1 (0.48%)   1 (0.70%) 0 (0.00%)  
Alcohol drinking status (%)
Never 66 (18.38%) 162 (77.14%) *Fisher < 0.0001 26 (18.31%) 74 (72.55%) Fisher < 0.0001
Ex-drinkers 3 (0.84%) 0 (0.00%)   1 (0.70%) 0 (0.0%)  
Current drinkers 283 (78.83%) 47 (22.38%)   114 (80.28%) 28 (27.45%)  
Miss 7 (1.95%) 1 (0.48%)   1 (0.70%) 0 (0.0%)  
Height (cm) 168.4 ± 6.2 158.0 ± 5.8  < 0.0001 171.3 ± 5.6 160.5 ± 5.6  < 0.0001
Weight (kg) 69.9 ± 10.1 53.7 ± 6.7  < 0.0001 71.7 ± 10.3 53.4 ± 7.0  < 0.0001
BMI (kg/m2) 24.6 ± 3.0 21.6 ± 2.6  < 0.0001 24.4 ± 3.2 20.7 ± 2.4  < 0.0001
Body composition according to BIA
BSM (kg) 29.09 ± 3.78 20.23 ± 2.38  < 0.0001 30.22 ± 3.64 20.57 ± 2.58  < 0.0001
BSM/height2 (kg/m2) 10.24 ± 0.98 8.10 ± 0.72  < 0.0001 10.30 ± 1.01 7.97 ± 0.78  < 0.0001
BFM (kg) 18.26 ± 5.59 16.50 ± 4.50 0.0001 18.17 ± 6.08 15.57 ± 4.13 0.0002
BFM/height2 (kg/m2) 6.45 ± 1.96 6.64 ± 1.91 0.2607 6.22 ± 2.11 6.06 ± 1.62 0.5226
Body composition according to CT image
SMA (cm2) 105.4 ± 16.22 69.78 ± 9.84  < 0.0001 107.9 ± 16.1 71.3 ± 10.5  < 0.0001
SMA/height2 (cm2/m2) 37.11 ± 5.51 27.95 ± 3.77  < 0.0001 36.83 ± 5.54 27.69 ± 3.76  < 0.0001
SMA/weight (cm2/kg) 1.51 ± 0.18 1.31 ± 0.17  < 0.0001 1.51 ± 0.17 1.34 ± 0.18  < 0.0001
SMA/BMI (cm2/kg/m2) 4.29 ± 0.54 3.26 ± 0.50  < 0.0001 4.44 ± 0.53 3.47 ± 0.52  < 0.0001
SMD (HU)* 41.46 (6.42) 39.52 (6.97)  < 0.0001 43.66 (5.92) 41.73 (6.33)  < 0.0001
IMAT (cm2) * 3.14 (3.52) 2.54 (2.75)  < 0.0001 2.54 (2.78) 1.82 (2.34) 0.002
IMAT/SMA (%) * 3.21 (3.39) 3.47 (4.12) 0.247 2.60 (2.58) 2.47 (2.97) 0.832
  1. Data presented as n (percentage) or mean (standard deviation) if not specified
  2. BMI: body mass index; BFM: body fat mass; BSM: body skeletal muscle; IMAT: intermuscular adipose tissue; SMA: skeletal muscle area; SMD: skeletal muscle radiodensity
  3. * Data presented as median (interquartile range)