Table 3.

Sensitivity, specificity, Yuden index, and area under the curve for various cutoff points of the xerostomia inventory questionnaire score in diagnosing dry mouth

Sub group	Category	cut-off point	Sensitivity	Specificity	YUDEN index	P_value1
Sex	Male	28	76.9%	100%	0.769	P = 0.260
	Female	24	84.60%	82.40%	0.699
Age	< 50	23.5	90.90%	87.50%	0.759
	>  = 50	26.5	61.10%	95%	0.561
	< 55	22.5	86.20%	82.70%	0.689	P = 0.821
	>  = 55	25.5	81.80%	82.10%	0.692
	< 60	23.5	82.90%	80.90%	0.667	P = 0.720
	>  = 60	26.5	80%	100%	0.8

¹P-value calculated for comparing the area under the curve in subgroups