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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

From: Evaluation of an automated thresholding algorithm for the quantification of paraspinal muscle composition from MRI images

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
  1. ICC intra-class correlation coefficient, CI confidence interval, SEM standard error of measurement, CSA cross-sectional area, FCSA functional cross-sectional area