Validation of the Chinese version of the PHQ-15 in a tertiary hospital

BMC Psychiatry

Table 5 Thresholds for the PHQ-15 based on IRT analysis

	Diff.	Coef.	Std. Err.	z	P > z	[95 % Conf.	Interval]
Item 1	1 vs 0	0.994	0.069	14.44	<0.001	0.859	1.129
	2 vs 1	2.132	0.124	17.13	<0.001	1.888	2.376
Item 2	1 vs 0	0.355	0.061	5.76	<0.001	0.235	0.476
	2 vs 1	2.024	0.108	18.75	<0.001	1.812	2.235
Item 3	1 vs 0	0.326	0.063	5.19	<0.001	0.203	0.448
	2 vs 1	1.532	0.091	16.83	<0.001	1.354	1.710
Item 4	1 vs 0	2.498	0.114	21.89	<0.001	2.274	2.721
	2 vs 1	2.583	0.228	11.34	<0.001	2.136	3.029
Item 5	1 vs 0	0.780	0.065	12.00	<0.001	0.652	0.907
	2 vs 1	2.472	0.137	18.10	<0.001	2.204	2.740
Item 6	1 vs 0	0.725	0.064	11.24	<0.001	0.598	0.851
	2 vs 1	2.338	0.128	18.22	<0.001	2.087	2.590
Item 7	1 vs 0	0.387	0.061	6.35	<0.001	0.268	0.506
	2 vs 1	2.587	0.135	19.17	<0.001	2.323	2.852
Item 8	1 vs 0	1.849	0.090	20.57	<0.001	1.673	2.025
	2 vs 1	2.187	0.157	13.96	<0.001	1.880	2.494
Item 9	1 vs 0	0.597	0.063	9.49	<0.001	0.474	0.720
	2 vs 1	2.389	0.128	18.62	<0.001	2.138	2.641
Item 10	1 vs 0	0.928	0.068	13.60	<0.001	0.794	1.062
	2 vs 1	1.914	0.114	16.85	<0.001	1.691	2.137
Item 11	1 vs 0	1.792	0.088	20.35	<0.001	1.619	1.964
	2 vs 1	2.202	0.155	14.21	<0.001	1.898	2.505
Item 12	1 vs 0	0.172	0.061	2.81	0.005	.0519	0.292
	2 vs 1	1.840	0.099	18.61	<0.001	1.646	2.033
Item 13	1 vs 0	0.203	0.061	3.32	0.001	0.083	0.323
	2 vs 1	1.942	0.103	18.88	<0.001	1.741	2.144
Item 14	1 vs 0	−0.485	0.067	−7.60	<0.001	−0.610	−0.360
	2 vs 1	1.719	0.090	19.23	<0.001	1.544	1.894
Item 15	1 vs 0	−0.843	0.062	−1.35	0.177	−0.207	0.038
	2 vs 1	1.403	0.084	16.79	<0.001	1.239	1.567

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