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Insights into Imaging

Table 3 Gray feature analysis of abdominal body composition

From: The association of body composition with abdominal aortic aneurysm growth after endovascular aneurysm repair

Gray features All Group(+) Group(−) p value
Mean value (HU)
Subcutaneous fat − 103.83 (− 107.89, − 97.34) − 102.94 (− 106.76, − 97.99) − 104.20 (− 108.16, − 96.68) .964
Visceral fat − 96.40 (− 99.55, − 91.75) − 95.20 (− 99.70, − 92.71) − 96.56 (− 99.62, − 91.33) .655
Pure muscle 36.12 ± 5.44 34.37 ± 5.24 36.90 ± 5.39 .037*
Intramuscular fat − 66.29 ± 4.09 − 67.29 ± 4.28 − 65.85 ± 3.95 .114
Total fat − 99.27 (− 103.05, − 94.67) − 99.01 (− 103.18, − 96.75) − 99.86 (− 103.09, − 93.17) .854
Total muscle 30.20 (23.35, 34.04) 23.92 (20.75, 32.66) 31.16 (26.16, 36.13) .019*
Standard deviation
Subcutaneous fat 22.24 (20.84, 23.56) 22.94 (20.47, 24.32) 22.03 (20.86, 23.40) .835
Visceral fat 24.50 ± 2.01 24.70 ± 2.17 24.42 ± 1.95 .537
Pure muscle 27.00 (26.15, 28.23) 27.68 (27.01, 28.46) 26.65 (25.97, 28.08) .005*
Intramuscular fat 23.25 ± 2.18 23.66 ± 2.31 23.07 ± 2.12 .225
Total fat 23.93 ± 2.08 23.99 ± 2.20 23.91 ± 2.04 .872
Total muscle 36.96 ± 4.46 38.82 ± 4.66 36.12 ± 4.14 .006*
Kurtosis
Subcutaneous fat 4.19 (3.77, 4.69) 4.15 (3.80, 4.70) 4.23 (3.61, 4.67) .990
Visceral fat 3.04 (2.83, 3.35) 2.99 (2.76, 3.58) 3.08 (2.87, 3.34) .542
Pure muscle 3.75 ± 0.37 3.65 ± 0.28 3.79 ± 0.39 .048*
Intramuscular fat 2.68 (2.45, 2.94) 2.58 (2.38, 2.77) 2.75 (2.48, 2.98) .040*
Total fat 3.39 ± 0.45 3.41 ± 0.48 3.38 ± 0.44 .736
Total muscle 5.16 ± 0.83 4.79 ± 0.80 5.32 ± 0.80 .004*
Skewness
Subcutaneous fat 1.12 (0.92, 1.24) 1.12 (0.98, 1.23) 1.13 (0.87, 1.24) .847
Visceral fat 0.58 (0.38, 0.74) 0.56 (0.39, 0.74) 0.59 (0.37, 0.74) .964
Pure muscle − 0.19 ± 0.29 − 0.09 ± 0.24 − 0.23 ± 0.30 .023*
Intramuscular fat − 0.55 (− 0.65, − 0.45) − 0.50 (− 0.60, − 0.43) − 0.56 (− 0.70, − 0.48) .054
Total fat 0.82 (0.64, 0.90) 0.80 (0.67, 0.88) 0.84 (0.62, 0.90) .945
Total muscle − 1.14 (− 1.23, − 0.95) − 1.04 (− 1.19, − 0.87) − 1.15 (− 1.31, − 1.00) .040*
  1. Unless otherwise specified, data are mean ± standard deviation or median (interquartile range). Group(+) represents patients with an aneurysm expansion, and Group(−) represents patients with a stable or shrunken aneurysm
  2. HU Hounsfield unit
  3. *p values in bold highlight the figures less than .05
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