Table 3.

ROC curve analysis of preoperative parameters for two-level osteotomy selection

Preoperative parameters	AUC	P value	95% Confidence interval
			Lower	Upper
CBVA	0.844	< 0.001	0.761	0.927
GK	0.828	< 0.001	0.746	0.910
SVA	0.735	< 0.001	0.632	0.837
LL	0.686	0.007	0.558	0.814
TK	0.653	0.025	0.521	0.785

ROC receiver-operating characteristic, AUC area under the ROC curve, CBVA chin-brow vertical angle, GK global kyphosis, SVA sagittal vertical axis, LL lumbar lordosis, TK thoracic kyphosis. Significance set as P < 0.05