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. 2011 Mar 1;469(12):3371–3378. doi: 10.1007/s11999-011-1820-3

Table 4.

Difference in mean angular measurements between radiographs and 3D CT

Measurement parameter Modality Trial 1 Trial 2
Mean SD Mean SD
Angulation (°) Radiograph 12.5 10.3 11.6 11.0
3D CT 19.4 11.2 17.7 12.7
Difference 6.9 12.0 6.1 12.3
p value < 0.0001 0.0002
GPA (°) Radiograph 28.2 6.8 27.1 6.6
3D CT 34.1 5.5 34.1 5.6
Difference 6.0 6.7 7.0 6.0
p value < 0.0001 < 0.0001

3D = three-dimensional; GPA = glenopolar angle.