Intra- and Inter-Rater Reliability of Processing Ultrasound Tissue Characterization Scans in Midportion Achilles Tendinopathy

Table 2

Mean echo-types percentages of the participants’ Achilles tendons (reviewer 1, MM; rating 1).

Echo-type	Midportion total group (n = 50) mean ± SD (min–max)	AoMD total group (n = 50) mean ± SD (min–max)
Echo-type I%	47.6 ± 11.9 (24.7–75.2)	37,1 ± 12,2 (14.7–64.8)
Echo-type II%	20.3 ± 5.3 (10.5–35.8)	22.5 ± 7.6 (10.8–42.9)
Echo-type III%	19.4 ± 9.2 (2.6–43.0)	26.6 ± 12.2 (1.5–49.7)
Echo-type IV%	12.7 ± 6.7 (1.9–29.2)	13.5 ± 6.8 (0.4–28.0)
Total	100%	100%
Echo-type I + II%	67.9 ± 15.0 (40.4–95.3)	59.6 ± 17.6 (30.0–98.1)
Echo-type III + IV%	31.9 ± 15.3 (4.7–59.6)	40.1 ± 18.0 (1.9–70.0)
Total	100%	100%

Echo-types I, II, III, and IV are expressed as a percentage of the analyzed Achilles tendon volume. Combined, the echo-types I + II represent aligned fibrillar structure, and the echo-types III + IV disorganized tendon structure. SD: standard deviation; min: minimum; max: maximum; AoMD: area of maximum degeneration (1 slide in the Achilles tendon midportion with the lowest representation of echo-type I).