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Table 1 The intra- and inter-inter-observer error and the effects caused by pelvic tilt

From: How to judge pelvic malposition when assessing acetabular index in children? Three simple parameters can determine acceptability

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 ± 3.96.2, − 6.67.2, − 8.0Yes
− 9− 0.1 ± 0.90.1 ± 1.2− 0.7 ± 3.54.3, − 4.26.2, − 7.5Yes
− 6− 0.2 ± 0.90.3 ± 1.3− 0.9 ± 2.34.6, − 4.33.7, − 5.5No
− 3− 0.3 ± 1.00.2 ± 1.6− 0.7 ± 1.74.9, − 5.12.6, − 4.0No
0− 0.1 ± 1.2− 0.1 ± 2.4.006.8, − 7.20
30.0 ± 1.80.0 ± 2.60.4 ± 1.88.8, − 8.83.9, − 3.1No
60.2 ± 1.90.1 ± 2.30.9 ± 2.48.3, − 7.95.6, − 3.7No
90.1 ± 1.70.0 ± 2.11.8 ± 3.07.5, − 7.27.6, − 4.1Yes
120.1 ± 2.1− 0.7 ± 3.32.8 ± 4.610.0, − 11.411.8, − 6.3Yes
  1. Expressed as Mean ± SD
  2. #Expressed as 95% confidence interval