. 2020 Sep 14;49(3):219–226. doi: 10.1007/s00240-020-01212-8

Table 4.

Comparison of the prediction ability for an outcome of ‘stone-free’ after extracorporeal shock wave lithotripsy using the volume and stone axis measurements generated by StoneChecker

Variables	Sig	Exp (B)	95% CI for Exp (B)		Nagelkerke R Square
Variables	Sig	Exp (B)	Lower	Upper	Nagelkerke R Square
Major axis length (mm)	0.036	0.806	0.66	0.986	0.099
Vertical axis length (mm)	0.034	0.828	0.696	0.986	0.100
Area of largest slice/ROI (mm²)	0.014	0.964	0.936	0.993	0.156
Stone volume (mm³)	0.008	0.994	0.99	0.999	0.217

The higher value of Nagelkerke R Square indicates better prediction of stone-free rate outcome

CI, confidence interval; ROI, region of interest