Table 4 Results of ROC analysis

Average of the lowest T-score

0.791 (0.674-0.909)

< 0.001

−2.55

87.5%

65%

Average HU value

 L1

0.907 (0.840-0.975)

< 0.001

124.6

93.8%

78.3%

 L1-L4 horizontal plane

0.909 (0.834-0.984)

< 0.001

115.7     

93.8%

81.7%

 L1-L4 sagittal plane

0.891 (0.809-0.973)

< 0.001

114.9

87.5%

81.7%

 Operated segment

0.880 (0.789-0.970)

< 0.001

116.1

93.8%

80.0%

 Upper vertebrae of operated segment

0.885 (0.785-0.986)

< 0.001

111.8

93.8%

81.7%

 Lower vertebrae of operated segment

0.866 (0.782-0.949)

< 0.001

121.0

93.8%

73.3%