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Table 5 Agreement between assessed parameters on plain x-ray

From: Binary Tönnis classification: simplified modification demonstrates better inter- and intra-observer reliability as well as agreement in surgical management of hip pathology

   Reader 1 Reader 2 Reader 3 Reader 4 Reader 5 Average
Tönnis Classification 0 18 (45%) 17 (42.5%) 2 (5%) 10 (25%) 13 (32.5%) 12 (30%)
1 5 (12.5%) 7 (17.5%) 10 (25%) 12 (30%) 11 (27.5%) 9 (22.5%)
2 3 (7.5%) 5 (12.5%) 12 (30%) 5 (12.5%) 5 (12.5%) 6 (15%)
3 14 (35%) 11 (27.5%) 16 (40%) 13 (32.5%) 11 (27.5%) 13 (32.5%)
Binary Classification 0 24 (60%) 23 (57.5%) 20 (50%) 24 (60%) 22 (55%) 22.6 (56.5%)
1 16 (40%) 17 (42.5%) 20 (50%) 16 (40%) 18 (45%) 17.4 (43.5%)
Tönnis Relation to Surgery Preservation (n = 19) 19 (100%) 19 (100%) 10 (52.63%) 17 (89.47%) 19 (100%) 16.8 (88.42%)
Replacement (n = 21) 17 (80.95%) 16 (76.19%) 19 (90.48%) 16 (76.19%) 16 (76.19%) 16.8 (80%)
  36 (90%) 35 (87.5%) 29 (72.5%) 33 (82.5%) 35 (87.5%) 33.6 (84%)
Binary Relationship to Surgery Preservation (n = 19) 19 (100%) 19 (100%) 17 (89.47%) 19 (100%) 17 (89.47%) 18.2 (45.5%)
Replacement (n = 21) 16 (76.19%) 17 (80.95%) 18 (85.71%) 16 (76.19%) 16 (76.19%) 16.6 (41.5%)
  35 (87.5%) 36 (90%) 35 (87.5%) 35 (87.5%) 33 (82.5%) 34.8 (87%)