Table 4 Differences in median (interquartile range) gap and step-off measurements between more-experienced and less-experienced observers.
From: The accuracy of gap and step-off measurements in acetabular fracture treatment
| Â | More-experienced observers | Less-experienced observers | P-value |
|---|---|---|---|
Preoperative gap | |||
Radiographs | 6.3 (1.9–10.7) mm | 7.7 (1.9–14.2) mm | 0.003 |
CT scans | 17.5 (10.5–28.9) mm | 19.5 (11.3–26.0) mm | 0.080 |
Preoperative step-off | |||
Radiographs | 6.3 (0.6–18.1) mm | 3.7 (0–8.7) mm | 0.000 |
CT scans | 9.0 (3.5–13.9) mm | 9.5 (5.3–15.0) mm | 0.024 |
Postoperative gap | |||
Radiographs | 0.0 (0.0–2.3) mm | 2.9 (2.9–4.4) mm | 0.000 |
CT scans | 3.5 (2.1–5.5) mm | 8.0 (6.0–10.0) mm | 0.000 |
Postoperative step-off | |||
Radiographs | 0.0 (0.0–0.0) mm | 0.0 (0.0–0.0) mm | 0.823 |
CT scans | 1.0 (0.0–2.4) mm | 4.0 (1.3–5.8) mm | 0.000 |
