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Table 6 Echo-type values in harvested and unharvested tendons – one acquisition made by one examiner with two examiners analyzing (the same scan data)

From: Reliability and methodology of quantitative assessment of harvested and unharvested patellar tendons of ACL injured athletes using ultrasound tissue characterization

Inter-rater reliability of analysis - 1 acquisition/ 1 day/ 2 examiners/ 2 analysis per patellar tendon
Area/ Echo-types Examiner 1 (C.S.P.) Examiner 2 (R.C.G.S.)    
Type I (%) Type II (%) Type III (%) Type IV (%) Type I (%) Type II (%) Type III (%) Type IV (%) ICC (95% CI) SEM (ICC) % GrM (%) SEM (ICC) (%)
Harvested patellar tendons of 17 participants (n = 20)
 Patellar Apex 52.8 ± 10.0 31.3 ± 6.3 10.4 ± 5.9 5.4 ± 3.5 52.0 ± 10.0 32.3 ± 6.9 10.5 ± 5.8 5.3 ± 3.0 0.98 (0.97, − 0.98) 10.5 2.6
 Proximal tendon 57.4 ± 8.8 29.4 ± 4.8 8.7 ± 5.8 4.7 ± 4.0 57.3 ± 7.9 29.3 ± 5.0 8.6 ± 4.8 4.8 ± 3.2 0.99 (0.97, − 0.99) 10.4 2.6
 Mid Tendon 58.5 ± 10.1 28.1 ± 4.8 8.8 ± 6.2 5.0 ± 3.9 58.5 ± 10.8 29.0 ± 7.3 7.8 ± 6.8 4.9 ± 4.7 0.98 (0.97, − 0.98) 11.3 2.8
 Distal Tendon 47.1 ± 8.7 29.3 ± 8.6 15.7 ± 8.0 7.9 ± 5.2 48.8 ± 11.1 30.5 ± 9.1 13.8 ± 7.7 7.1 ± 5.1 0.95 (0.92, − 0.96) 15.2 3.8
 Overall Tendon 50.7 ± 7.3 28.7 ± 5.8 13.7 ± 6.6 7.1 ± 4.5 51.2 ± 6.0 29.9 ± 5.5 12.6 ± 5.6 6.6 ± 4.0 0.99 (0.98, − 0.99) 6.8 1.7
Unharvested patella tendons of 15 participants (n = 19)
 Patellar Apex 62.2 ± 6.7 36.6 ± 6.2 0.8 ± 1.2 0.3 ± 0.5 60.9 ± 11.3 37.3 ± 10.4 1.4 ± 2.1 0.4 ± 1.0 0.97 (0.94–0.97) 19.1 4.8
 Proximal tendon 70.2 ± 5.6 29.0 ± 5.5 0.4 ± 0.8 0.2 ± 0.4 68.3 ± 6.9 30.3 ± 6.3 0.9 ± 1.3 0.3 ± 0.5 0.99 (0.98–0.99) 12.8 3.2
 Mid Tendon 72.6 ± 6.3 26.5 ± 6.6 0.5 ± 0.8 0.2 ± 0.5 70.7 ± 5.5 27.4 ± 5.2 1.0 ± 1.7 0.6 ± 1.2 0.99 (0.97–0.99) 13.7 3.4
 Distal Tendon 58.3 ± 10.9 36.8 ± 9.4 3.7 ± 3.9 1.3 ± 1.5 57.9 ± 10.0 37.6 ± 6.7 3.3 ± 4.7 1.2 ± 1.9 0.95 (0.91–0.96) 23.0 5.8
 Overall Tendon 64.3 ± 5.4 31.4 ± 5.4 2.9 ± 2.4 1.1 ± 1.2 63.3 ± 4.4 33.0 ± 4.1 2.8 ± 2.5 1.1 ± 1.1 0.99 (0.98–0.99) 9.4 2.3
  1. n = number of tendons assessed. Mean ± standard deviation
  2. ICC (95% CI) Intra-class coefficient of reliability (95% confidence interval), SEM % GrM Standard error of measurement as percentage of the grand mean, SEM Standard error of measurement