Table 4.

Cutoff values of the preoperative radiographic measurements

Parameters	Number of subjects (corrected group)	Number of subjects (undercorrected group)	Area under the ROC curve	95% CI	p value	Cutoff value
AP talus-first metatarsal angle (°)	54	21	0.729	0.614–0.825	0.0001	> 23°
Lateral talus-first metatarsal angle (°)	45	30	0.754	0.641–0.847	< 0.0001	> 36°
naviculocuboid overlap (%)	47	28	0.645	0.526–0.752	0.0319	> 72%

Corrected group = patients whose radiographic indices improved over the mean value of normal alignment; undercorrected group = patients whose radiographic indices did not reach the mean value of normal alignment; ROC curve = receiver operating characteristic curve; the ROC curve was used to define the cutoff values of the preoperative radiographic measurements between the corrected and the undercorrected groups after calcaneal lengthening.