Table 3.
Subgroup analysis according to spine anatomy.
| Subgroup | Distance difference (mm) | Technical success (%) | CSA error (%) | Bland–Altman (mean ± limits of agreement) | ||||
|---|---|---|---|---|---|---|---|---|
| SMA | Sfat | Vfat | SMA | Sfat | Vfat | |||
| Normal anatomy (n = 943) | 2.6 ± 6.0 | 96.5 | 2.22 ± 2.46 | 3.46 ± 4.78 | 3.57 ± 5.58 | 1.68 ± 7.22 | -2.29 ± 13.13 | -0.84 ± 10.03 |
| Thoracolumbar variation (n = 46) | 7.4 ± 11.9 | 82.6 | 2.73 ± 2.24 | 5.83 ± 8.79 | 5.87 ± 7.04 | 2.23 ± 7.90 | 2.41 ± 34.33 | -2.69 ± 24.10 |
| Lumbosacral variation (n = 72) | 13.4 ± 15.2 | 63.9 | 3.04 ± 2.49 | 8.72 ± 10.63 | 7.94 ± 9.23 | 1.40 ± 10.56 | 2.17 ± 35.93 | 0.86 ± 24.84 |
| Numeric variation (n = 11) | 16.5 ± 16.1 | 54.5 | 2.37 ± 2.11 | 10.87 ± 7.62 | 10.36 ± 10.19 | -0.22 ± 7.10 | -3.93 ± 46.02 | -1.82 ± 26.79 |
| Combined variation (n = 10) | 21.4 ± 17.0 | 40 | 4.06 ± 2.92 | 11.86 ± 12.66 | 14.95 ± 17.03 | -2.53 ± 14.78 | -7.15 ± 58.06 | 10.82 ± 67.40 |
CSA cross-sectional area, Sfat subcutaneous fat area, SMA skeletal muscle area, Vfat visceral fat area.