Fig. 3From: Risk factor analysis of disc and facet joint degeneration after intersegmental pedicle screw fixation for lumbar spondylolysisLogistic regression and ROC analysis. a L4/5: a cutoff value of 15.5Â months at which classification according to fixed time yields a sensitivity of 100% and specificity of 60%. The area under the curve AUC is 0.80. b L5S1: a cutoff value of 21.0Â months at which classification according to fixed time yields a sensitivity of 89% and specificity of 89%. The area under the curve AUC is 0.80Back to article page