| Observer | Moment of evaluation | Moment | n | mean | SD | median | IR | minimum | maximum |
| 2nd year resident doctor | preoperative | M1 | 100 | −7.48 | 14.38 | −9.6 | −17.0 - 1.0 | −45.5 | 36 |
| preoperative | M2 | 100 | −6.61 | 14.84 | −9.1 | −17.2 - 2.7 | −43.5 | 36.2 | |
| postoperative | M1 | 100 | −2.17 | 4.27 | −2.5 | −5.3 - 0.8 | −14.3 | 9.2 | |
| postoperative | M2 | 100 | −2.20 | 4.38 | −2.4 | −5.1 - 0.1 | −13.4 | 7.6 | |
| stage of improvement in knee surgery | preoperative | M1 | 100 | −8.39 | 14.63 | −10.8 | −17.0 - 0.0 | −45 | 38 |
| preoperative | M2 | 100 | −7.71 | 14.90 | −10.1 | −17.3 - 2.7 | −45 | 35 | |
| postoperative | M1 | 100 | −2.08 | 3.94 | −2.2 | −4.9 - 0.0 | −14.2 | 7.1 | |
| postoperative | M2 | 100 | −1.72 | 3.95 | −1.6 | −4.1 - 0.0 | −13.6 | 7.9 | |
| Surgeon > 10 years of experience | preoperative | M1 | 100 | −6.58 | 14.67 | −9.4 | −16.9 - 2.9 | −41.8 | 34.5 |
| preoperative | M2 | 100 | −7.53 | 14.26 | −10.4 | −16.8 - 1.3 | −42.1 | 36.9 | |
| postoperative | M1 | 100 | −1.96 | 4.53 | −1.9 | −4.7 - 0.3 | −14.3 | 8.8 | |
| postoperative | M2 | 100 | −2.36 | 4.74 | −3.0 | −5.6 - 1.2 | −14.7 | 10.9 | |
| Surgeon < 10 years of experience | preoperative | M1 | 100 | −8.69 | 14.72 | −11.0 | −18.2 - −0.1 | −50.6 | 36.1 |
| preoperative | M2 | 100 | −8.14 | 14.95 | −10.7 | −18.1 - 2.0 | −50.3 | 36 | |
| postoperative | M1 | 100 | −2.77 | 4.66 | −2.7 | −6.0 - 0.4 | −13.9 | 8 | |
| postoperative | M2 | 100 | −2.85 | 4.51 | −2.7 | −6.1 - 0.3 | −13.5 | 8.3 |