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. 2019 May 9;9(5):e027725. doi: 10.1136/bmjopen-2018-027725

Table 2.

Reliability of strain elastography in the supraspinatus tendon using respectively the deltoid muscle (reference) and a gel pad (reference) and raw data from the study phase (n = 40)

Continuous scale Mean (SD) Mean (SD) Mean
Difference (SD)
P LOA SEM MDC (%) ICC (95% CI)
Mean across tendon
Intra-rater Rater 1 Rater 1
 RAW 4.40 (0.55) 4.36 (0.55) 0.04 (0.14) 0.09 −0.24; 0.33 0.10 0.28 (6.36) 0.97 (0.93 to 0.98)
 DELT (ratio) 14.33 (3.07) 14.23 (3.16) 0.10 (1.48) 0.66 −2.81; 3.01 1.05 2.91 (20.37) 0.89 (0.80 to 0.94)
 GEL (ratio) 2.87 (1.28) 2.59 (1.01) 0.28 (0.82) 0.04* −1.33; 1.89 0.58 1.61 (58.82) 0.73 (0.54 to 0.85)
Inter-rater Rater 1 Rater 2
 RAW 4.40 (0.55) 4.53 (0.61) −0.13 (0.24) 0.00* −0.60; 0.34 0.17 0.47 (10.53) 0.89 (0.75 to 0.95)
 DELT (ratio) 14.33 (3.07) 14.56 (2.60) −0.22 (1.88) 0.46 −3.91; 3.46 1.33 3.69 (25.51) 0.78 (0.63 to 0.88)
 GEL (ratio) 2.87 (1.28) 2.73 (1.00) 0.14 (0.89) 0.32 −1.61; 1.90 0.63 1.75 (62.63) 0.70 (0.50 to 0.83)

*significant difference (p≤0.05) between measurements; DELT, reference area in the deltoid muscle; GEL, reference area in the gel pad; ICC (95% CI), intraclass correlation coefficient with 95% CI; LOA, limits of agreement; MDC, minimal detectable change; RAW, raw elastography data.