Table 1 The intra- and inter-inter-observer error and the effects caused by pelvic tilt
Pelvic tilt/° | Intra-observer error* | Inter-observer error* | AI variance* | Total measurement error# | AI variance# | Effect |
|---|---|---|---|---|---|---|
− 12 | − 0.1 ± 0.9 | − 0.1 ± 2.4 | − 0.4 ± 3.9 | 6.2, − 6.6 | 7.2, − 8.0 | Yes |
− 9 | − 0.1 ± 0.9 | 0.1 ± 1.2 | − 0.7 ± 3.5 | 4.3, − 4.2 | 6.2, − 7.5 | Yes |
− 6 | − 0.2 ± 0.9 | 0.3 ± 1.3 | − 0.9 ± 2.3 | 4.6, − 4.3 | 3.7, − 5.5 | No |
− 3 | − 0.3 ± 1.0 | 0.2 ± 1.6 | − 0.7 ± 1.7 | 4.9, − 5.1 | 2.6, − 4.0 | No |
0 | − 0.1 ± 1.2 | − 0.1 ± 2.4 | .00 | 6.8, − 7.2 | 0 | – |
3 | 0.0 ± 1.8 | 0.0 ± 2.6 | 0.4 ± 1.8 | 8.8, − 8.8 | 3.9, − 3.1 | No |
6 | 0.2 ± 1.9 | 0.1 ± 2.3 | 0.9 ± 2.4 | 8.3, − 7.9 | 5.6, − 3.7 | No |
9 | 0.1 ± 1.7 | 0.0 ± 2.1 | 1.8 ± 3.0 | 7.5, − 7.2 | 7.6, − 4.1 | Yes |
12 | 0.1 ± 2.1 | − 0.7 ± 3.3 | 2.8 ± 4.6 | 10.0, − 11.4 | 11.8, − 6.3 | Yes |