Table 4.

Sensitivity, specificity, AUC, PPV, NPV with 95% CI for each optional cut-off based on Youden’s criterion

	No depression versus
	≥mild depressive symptoms	≥moderate depressive symptoms	≥moderately severe depressive symptoms
Cut-off	≥3	≥4	≥4
Sensitivity (95% CI)	76.4 (73.8 to 78.8)	68.8 (63.3 to 73.9)	81.9 (71.1 to 90.0)
Specificity (95% CI)	62.2 (57.6 to 66.6)	54.7 (52.0 to 57.4)	51.7 (49.2 to 54.2)
PPV (95% CI)	83.6 (80.9 to 85.4)	26.0 (24.0 to 31.1)	7.2 (6.5 to 13.3)
NPV (95% CI)	51.0 (47.6 to 55.8)	88.3 (85.6 to 89.4)	98.4 (97.2 to 98.6)
J	0.39	0.24	0.34
AUC (95% CI)	0.73 (0.70 to 0.75)	0.66 (0.62 to 0.69)	0.73 (0.67 to 0.79)
SE	0.01	0.02	0.03
z	17.17***	9.01***	7.45**

***p<0.000; **p<0.01.

AUC, area under the curve; J, Youden’s index; NPV, negative predictive value; PPV, positive predictive value.;