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Table 2 The intra- and inter-inter-observer error and the effects caused by pelvic rotation

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

Pelvic rotation/°Intra-observer error*Inter-observer error*Left AI variance*Right AI variance*Total measurement error#Left AI variance#EffectRight AI variance#Effect
− 12− 0.1 ± 1.7− 0.0 ± 2.40.5 ± 4.00.4 ± 4.07.8, − 8.08.4, − 7.4Yes8.2, − 7.6Yes
− 9− 0.0 ± 1.60.1 ± 1.60.1 ± 3.90.1 ± 3.56.4, − 6.27.6, − 7.6Yes6.9, − 6.7Yes
− 6− 0.1 ± 1.40.2 ± 1.7− 0.1 ± 1.9− 0.1 ± 1.36.1, − 6.03.7, − 3.8No2.4, − 2.5No
− 30.0 ± 1.30.1 ± 2.10.1 ± 1.90.0 ± 1.16.9, − 6.73.7, − 3.6No2.1, − 2.1No
0− 0.1 ± 1.2− 0.1 ± 2.40.000.006.8, − 7.200
30.1 ± 1.10.3 ± 2.00.1 ± 1.4− 0.4 ± 1.86.4, − 5.53.0, − 2.7No3.0, − 3.9No
6− 0.1 ± 1.10.2 ± 1.70.4 ± 1.8− 0.1 ± 1.75.6, − 5.33.9, − 3.0No3.3, − 3.5No
90.3 ± 1.20.1 ± 2.30.9 ± 3.7− 0.3 ± 3.97.2, − 6.48.1, − 6.2Yes7.4, − 8.0Yes
120.2 ± 1.5− 0.1 ± 2.01.2 ± 3.6− 0.4 ± 4.07.1, − 6.78.2, − 5.9Yes7.5, − 8.3Yes
  1. Expressed as Mean ± SD
  2. #Expressed as 95% confidence interval