Cut-off points for VRS categories on NRS using receiver operating characteristic (ROC) curves.

Table 5: Cut-off points for VRS categories on NRS using receiver operating characteristic (ROC) curves.

VRS categories		NRS cut- off points	ROC curve
Control	Test	NRS cut- off points	Sensitivity	AUC	p-value	95% CI
Mild	Moderate	> 3.25	91.67	0.871	< 0.0001	0.8079 to 0.9344
Moderate	Severe	> 6.5	100.0	0.9833	< 0.0001	0.97 to 0.9967
Mild	Severe	> 6.5	100.0	0.9935	< 0.0001	0.98 to 1.007