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Table 5 Intra-rater reliability and agreement -ICC values and corresponding confidence intervals and mean difference with agreement intervals

From: Musculoskeletal diagnostic ultrasound imaging for thickness measurement of four principal muscles of the cervical spine -a reliability and agreement study

Muscle Repeatability between days - same image measured on two separate occasions Repeatability between scans – measurement of two different images of the same muscle
ICC (95% CI) Mean difference (95% LoA)(mm) ICC (95% CI) Mean difference (95% LoA)(mm)
Right Lcol 0.97 (.94–.98) 0.00 (−0.90; 0.90) 0.82 (.70–.89) 0.03 (−2.07; 2.14)
Right Rcpm 0.95 (.89–.97) 0.17 (−0.73; 1.95) 0.86 (.75–.93) −0.17 (−1.57; 1.23)
Right Dce 0.81 (.70–.89) 0.02 (−1.70; 1.74) 0.52 (.29–.70) −0.11 (−2.66; 2.44)
Right Sscap 0.97 (.95–.99) −0.01 (−0.34; 0.32) 0.95 (.91–.97) 0.02 (−0.37; 0.37)