Table 2 Intra-rater reliability indexes for the manual thresholding technique and automated thresholding algorithm for the right multifidus and erector spinae muscles at L4–L5 and L5–S1
Parameter | Manual thresholding technique | Automated thresholding algorithm | ||||
|---|---|---|---|---|---|---|
Mean (SD) | ICC (95% CI) | SEM | Mean (SD) | ICC (95% CI) | SEM | |
Multifidus L4–L5 | ||||||
CSA (cm2) | 9.87 (1.81) | 0.99 (0.97–1.00) | 0.18 | 9.87 (1.85) | 0.99 (0.97–1.00) | 0.19 |
FCSA (cm2) | 4.54 (1.79) | 0.97 (0.93–0.99) | 0.31 | 4.23 (1.66) | 0.99 (0.99–1.00) | 0.20 |
Fat CSA (cm2) | 5.33 (1.42) | 0.95 (0.89–0.97) | 0.32 | 5.56 (1.39) | 0.99 (0.97–1.00) | 0.20 |
Fat % | 0.55 (0.13) | 0.95 (0.91–0.98) | 0.03 | 0.57 (0.12) | 0.99 (0.98–1.00) | 0.01 |
Erector spinae L4–L5 | ||||||
CSA (cm2) | 16.31 (3.38) | 0.99 (0.98–1.00) | 0.34 | 16.67 (3.53) | 0.98 (0.95–0.99) | 0.49 |
FCSA (cm2) | 7.25 (2.51) | 0.98 (0.96–0.99) | 0.35 | 7.18 (2.55) | 0.97 (0.94–0.98) | 0.44 |
Fat CSA (cm2) | 9.06 (2.37) | 0.96 (0.92–0.98) | 0.34 | 9.49 (2.45) | 0.99 (0.99–1.99) | 0.25 |
Fat % | 0.56 (0.11) | 0.95 (0.89–0.97) | 0.02 | 0.57 (0.11) | 0.99 (0.99–1.00) | 0.01 |
Multifidus L5–S1 | ||||||
CSA (cm2) | 11.40 (1.72) | 0.99 (0.98–1.00) | 0.17 | 11.34 (1.82) | 0.98 (0.96–0.99) | 0.26 |
FCSA (cm2) | 5.34 (1.94) | 0.97 (0.88–0.98) | 0.33 | 5.26 (1.95) | 0.99 (0.98–1.00) | 0.19 |
Fat CSA (cm2) | 6.06 (1.52) | 0.95 (0.56–0.98) | 0.34 | 6.08 (1.17) | 0.99 (0.97–0.99) | 0.12 |
Fat % | 0.54 (0.14) | 0.97 (0.78–0.99) | 0.02 | 0.54 (0.12) | 0.99 (0.98–1.00) | 0.01 |
Erector spine L5–S1 | ||||||
CSA (cm2) | 11.03 (3.97) | 0.99 (0.98–1.00) | 0.40 | 11.65 (4.05) | 0.98 (0.96–0.99) | 0.57 |
FCSA (cm2) | 3.24 (2.21) | 0.98 (0.94–0.99) | 0.31 | 4.09 (2.21) | 0.97 (0.94–0.98) | 0.38 |
Fat CSA (cm2) | 7.78 (2.36) | 0.97 (0.66–0.99) | 0.41 | 7.56 (2.43) | 0.98 (0.97–0.99) | 0.34 |
Fat % | 0.73 (0.12) | 0.97 (0.62–0.99) | 0.02 | 0.66 (0.10) | 0.97 (0.94–0.98) | 0.02 |