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Table 1 Baseline characteristics of MrOs sample (n = 475)

From: Kyphosis and paraspinal muscle composition in older men: a cross-sectional study for the osteoporotic fractures in men (MrOS) research group

  Full sample mean (SD) Stratified by BMI mean (SD)
   BMI < 30 (n = 399) BMI ≥30 (n = 76) p-value for differencea
Age (years) 74.2 (5.86) 74.7 (5.86) 71.6 (5.09) <.001
Cobb angle of kyphosis (degrees) 37.5 (11.90) 37.9 (12.0) 35.2 (11.3) .07
Height (cm) 173.6 (6.97) 173.7 (7.19) 172.9 (5.72) .28
Total hip BMD (g/cm2) 0.94 (0.14) 0.92 (0.14) 1.01 (0.13) <.001
BMI (kg/m2) 26.8 (3.21) 25.8 (2.37) 32.0 (1.54) <.001
Prevalent vertebral fracture (% yes) 9.68 10.5 5.26 0.16
Total paraspinal muscle volume (cm3) 18.6 (3.79) 18.7 (3.69) 18.0 (4.28) 0.15
Paraspinal muscle volume (cm3) 12.1 (3.47) 12.3 (3.42) 11.4 (3.64) 0.04
Paraspinal muscle attenuation (HU) 43.6 (5.48) 43.5 (5.40) 43.9 (5.91) 0.57
Paraspinal adipose tissue volume (cm3) 6.41 (2.61) 6.36 (2.65) 6.62 (2.37) 0.43
Total psoas muscle volume (cm3) 11.1 (2.65) 11.1 (2.58) 10.7 (2.98) 0.15
Psoas muscle volume (cm3) 10.0 (3.16) 10.2 (2.99) 8.82 (3.76) .003
Psoas muscle attenuation (HU) 51.53 (5.13) 51.64 (5.43) 50.98 (3.05) 0.14
Psoas adipose tissue volume (cm3) 1.07 (0.91) 0.92 (0.77) 1.85 (1.15) < .001
Total abdominal muscle volume (cm3) 63.9 (8.11) 63.5 (7.82) 65.8 (9.29) .048
Abdominal muscle volume (cm3) 48.3 (10.3) 48.9 (9.82) 45.2 (12.0) .01
Abdominal muscle attenuation (HU) 45.79 (4.36) 45.84 (4.54) 45.56 (3.30) 0.53
Abdominal adipose tissue volume (cm3) 15.6 (6.01) 14.6 (5.50) 20.6 (6.14) < .001
  1. ap-value represents t-test (for continuous variables) or Chi-square test (for categorical variables) for difference between those with BMI < 30 kg/m2 versus those with BMI ≥ 30 kg/m2.
  2. cm = centimeters; cm3 = centimeters3; g/cm2 = grams/centimeter2; kg/m2 = kilograms/meter2; HU = Hounsfield units.