Table 2: Criterion Validity for SRQ-20, SRQ-10 and GHQ-12

	Scale	Cut-off	Sensitivity	Specificity	PPV	NPV	% of Cases Screened Correctly	k	% Cases
Total	SRQ-20	7	0.85	0.94	0.68	0.97	92.6	0.71	16.5
		8	0.79	0.96	0.75	0.97	93.6	0.73	14.0
		9	0.57	0.96	0.70	0.93	90.8	0.57	10.8
	SRQ-10	7	0.81	0.95	0.71	0.97	92.8	0.71	15.3
		8	0.76	0.96	0.76	0.96	93.3	0.72	13.3
		9	0.71	0.98	0.84	0.96	94.4	0.74	11.3
	GHQ-12	2	0.66	0.86	0.43	0.94	83.2	0.42	21.6
		3	0.57	0.95	0.67	0.93	90.2	0.56	11.9
		4	0.34	0.97	0.67	0.90	88.6	0.39	6.8