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Table 4 Values of bias, SD, and average of the SD for each angle and for each observer (experts and non-experts)

From: Intra-observer and inter-observer errors in CT measurement of torsional profiles of lower limbs: a retrospective comparative study

  Bias 2–1 Bias 3–2 SD 2–1 SD 3–2 Δ Bias Δ SD Bias 2–1 Bias 3–2 SD 2–1 SD 3–2 Δ Bias Δ SD
  Expert 1 Expert 2
R-TFA 1 0 2.31 1.97 0 −0.34 0 0 1.55 2.09 0 0.54
R-TTA 1 0 5.94 2.25 −1 −3.69 0 0 1.71 1.90 0 0.19
L-TFA 0 0 5.39 1.55 −1 −3.84 0 0 1.20 1.89 0 0.69
L-TTA 2 0 2.36 3.21 0 0.85 0 0 2.25 1.76 0 −0.49
R-FAA 0 0 5.12 1.97 −2 −3.15 0 0 1.89 1.55 0 −0.34
L-FAA 0 0 3.15 1.63 0 −1.52 0 0 1.65 1.71 0 0.06
Average    4.05 2.10 −0.67 −1.95    1.71 1.82 0.00 0.11
  Non-expert 1 Non-expert 2
R-TFA 0 0 3.34 2.42 0 −0.92 0 0 3.49 2.33 0 −1.16
R-TTA 6 0 16.04 2.10 −6 −13.94 1 0 5.97 3.90 −1 −2.07
L-TFA 0 0 3.14 1.48 0 −1.66 0 1 4.19 3.74 1 −0.45
L-TTA 2 0 8.76 3.22 −2 −5.54 1 0 4.64 4.20 −1 −0.44
R-FAA 0 0 4.80 2.82 0 −1.98 0 1 4.63 4.92 1 0.29
L-FAA 1 1 7.32 4.49 0 −2.83 0 0 3.82 3.59 0 −0.23
Average    7.23 2.76 −1.33 −4.48    4.46 3.78 0.00 −0.68