Table 2.

Inter-rater reliability (ICC_3,k, 95% CI, SEM) of thickness measurements based on US acquisitions on different muscles of three examiners.

Muscle	Mean (±SD) (mm)	Expert-Novice 1	Expert-Novice 2	Novice 1-Novice 2
Pectoralis major	Expert: 9.3 (2.5) Novice 1: 9.5 (2.6) Novice 2: 9.3 (2.4)	0.967, 95% CI 0.943–0.981, SEM: 0.46	0.959, 95% CI 0.929–0.977, SEM: 0.49	0.926, 95% CI 0.871–0.957, SEM: 0.68
Rhomboid	Expert: 16.3 (3.4) Novice 1: 15.9 (3.2) Novice 2: 16.2 (3.3)	0.923, 95% CI 0.866–0.956, SEM: 0.91	0.920, 95% CI 0.861–0.954, SEM: 0.94	0.919, 95% CI 0.859–0.953, SEM: 0.93
Lower trapezius	Expert: 22.9 (5.4) Novice 1: 22.2 (5.0) Novice 2: 22.5 (4.8)	0.921, 95% CI 0.861–0.955, SEM: 1.45	0.939, 95% CI 0.894–0.965, SEM: 1.25	0.928, 95% CI 0.875–0.958, SEM: 1.30
Iliocostalis	Expert: 22.0 (6.6) Novice 1: 21.0 (6.3) Novice 2: 21.3 (6.6)	0.969, 95% CI 0.928–0.985, SEM: 1.13	0.980, 95% CI 0.960–0.990, SEM: 0.93	0.973, 95% CI 0.954–0.985, SEM: 1.06

ICC: intra-class correlation coefficient; SEM: standard error of measurement