Reliability and validity of the Thai version of the PHQ-9

BMC Psychiatry

Table 2 The performance of various PHQ-9 cut-off scores in detecting major depression

Cut-off score	Sensitivity	Specificity	Positive predictive value	Negative predictive value	Likelihood ratio – positive	Likelihood ratio – negative
≥ 6	0.95	0.48	0.12	0.99	1.81	0.11
≥ 7	0.95	0.55	0.13	0.99	2.12	0.095
≥ 8	0.89	0.65	0.16	0.99	2.56	0.16
≥ 9	0.84	0.77	0.21	0.99	3.71	0.2
≥ 10	0.74	0.85	0.27	0.98	5.04	0.31
≥ 11	0.68	0.89	0.31	0.97	6.13	0.36
≥ 12	0.68	0.90	0.34	0.98	7.12	0.35
≥ 13	0.63	0.94	0.43	0.97	10.26	0.39
≥ 14	0.47	0.96	0.47	0.96	12.32	0.55
≥ 15	0.37	0.97	0.50	0.95	13.68	0.65

ISSN: 1471-244X