Table 3.

Psychometric properties of the SRQ-20 with different cut-off scores

	Cut-off	Sensitivity	Specificity	PPV	NPV	PLR	NLR	Agreement	kappa
Male	7	0.69	0.59	0.81	0.43	1.67	0.52	62%	0.24
	8*	0.69	0.65	0.83	0.47	2.01	0.47	67%	0.31
	9	0.54	0.69	0.77	0.44	1.74	0.67	64%	0.21
Female	8	0.81	0.66	0.90	0.48	2.38	0.28	70%	0.39
	9	0.81	0.71	0.91	0.52	2.78	0.27	74%	0.44
	10*	0.81	0.80	0.92	0.62	4.16	0.23	81%	0.56
	11	0.69	0.83	0.87	0.61	4.03	0.38	79%	0.50
Total	7	0.76	0.61	0.86	0.45	1.97	0.39	66%	0.31
	8	0.76	0.66	0.87	0.48	2.12	0.37	69%	0.36
	9	0.69	0.70	0.84	0.49	2.30	0.44	70%	0.35
	10*	0.69	0.79	0.86	0.57	3.22	0.39	76%	0.45
	11	0.55	0.86	0.82	0.62	3.86	0.52	77%	0.42

* Optimal cut-of score; scores above this cut-off value give the best indication for possible psychopathology.

Note: PPV: positive predictive value; NPV: negative predictive value; PLR: positive likelihood ratio; NLR: negative likelihood ratio.