Figure 3

Cut-off value of ORPS using receiver operating characteristic curve. The cut-off value was 73% (area under the curve 0.712, 95% confidence interval 0.643–0.780, sensitivity 0.673, specificity 0.621). ORPS occupancy rate of pedicle screw.

Cut-off value of ORPS using receiver operating characteristic curve. The cut-off value was 73% (area under the curve 0.712, 95% confidence interval 0.643–0.780, sensitivity 0.673, specificity 0.621). ORPS occupancy rate of pedicle screw.