Number of insertions attempted | Number of unstripped insertions | Stripping rate (%) | Statistical difference in stripping rate | Unstripped screw tightness (%) (95% CI) | Statistical difference in tightness | |
---|---|---|---|---|---|---|
All insertions | ||||||
All participants | 3600 | 2400 | 33 | 78 (78–79) | ||
Surgeons | 1800 | 928 | 48 | p < 0.001 | 82 (81–83) | p < 0.001 |
Researchers | 1800 | 1470 | 18 | 76 (75–76) | ||
Plate insertions | ||||||
All participants | 1800 | 1204 | 33 | 76 (75–77) | ||
Surgeons | 900 | 472 | 48 | p < 0.001 | 82 (80–83) | p < 0.001 |
Researchers | 900 | 732 | 19 | 72 (71–74) | ||
Washer insertions | ||||||
All participants | 1800 | 1196 | 34 | 81 (80–81) | ||
Surgeons | 900 | 458 | 49 | p < 0.001 | 83 (82–84) | p < 0.001 |
Researchers | 900 | 738 | 18 | 79 (78–80) | ||
2.7 mm insertions | ||||||
All participants | 1200 | 670 | 44 | 79 (78–80) | ||
Surgeons | 600 | 218 | 64 | p < 0.001 | 83 (81–85) | p < 0.001 |
Researchers | 600 | 452 | 25 | 77 (76–79) | ||
3.5 mm insertions | ||||||
All participants | 1200 | 835 | 30 | 80 (79–81) | ||
Surgeons | 600 | 331 | 45 | p < 0.001 | 84 (83–85) | p < 0.001 |
Researchers | 600 | 504 | 16 | 77 (76–78) | ||
4.5 mm insertions | ||||||
All participants | 1200 | 885 | 26 | 77 (75–78) | ||
Surgeons | 600 | 381 | 37 | p < 0.001 | 80 (79–82) | p < 0.001 |
Researchers | 600 | 504 | 16 | 74 (72–76) |