Table 2.

Item parameters, fit statistics, local dependence, and DIF results for the 51 PROMIS® depression items

#	Item Stem	Item Parameters					Item Fit			b-DIF
		a	b1	b2	b3	b4	S-Χ2	d.f.	LD	Χ2	d.f.
1	I felt hopeless	4.46	0.38	0.97	1.53	2.23	116.2	88
2	I felt worthless	4.17	0.44	1.00	1.57	2.14	102.0	91
3	I felt depressed	3.84	−0.11	0.59	1.29	2.15	163.4	120
4	I felt unhappy	3.81	−0.39	0.41	1.27	2.06	151.5	120
5	I felt that nothing could cheer me up	3.73	0.32	0.94	1.73	2.34	99.4	98
6	I felt like a failure	3.73	0.19	0.72	1.58	2.05	137.2	116
7	I felt helpless	3.65	0.35	0.94	1.67	2.36	115.0	105
8	I felt that I wanted to give up on everything	3.6	0.56	1.1	1.6	2.3	111.3	95
9	I felt that I had nothing to look forward to	3.3	0.31	0.8	1.5	2.3	147.1	117
10	I felt that my life was empty	3.24	0.28	0.73	1.56	2.11	148.5	120
11	I felt emotionally exhausted	3.32	−0.18	0.49	1.27	2.05	126.0	133
12	I felt sad	3.20	−0.47	0.37	1.31	2.29	205.7	131
13	I felt I had no reason for living	3.1	0.92	1.5	1.9	2.6	83.2	71	21,29,35
14	I found that things in my life were overwhelming	3.1	−0.09	0.6	1.5	2.3	153.8	138
15	I felt that I was not needed	3.08	0.21	0.84	1.55	2.38	162.4	127
16	I felt disappointed in myself	3.05	−0.35	0.39	1.31	2.09	199.9	146
17	I felt like I needed help for my depression	3.0	0.54	1.01	1.7	2.2	150.2	105
18	I had trouble enjoying the things I used to enjoy	2.9	−0.09	0.60	1.4	2.2	165.2	146
19	I felt discouraged about the future	2.92	−0.26	0.37	1.31	2.09	159.4	153
20	I felt that I was to blame for things	2.88	−0.02	0.73	1.63	2.38	181.3	141
21	I wished I were dead and away from it all	2.8	1.01	1.5	2.1	2.6	103.3	71	13,29,35
22	I felt upset for no reason	2.83	0.23	0.93	1.85	2.93	135.3	117
23	I felt that nothing was interesting	2.83	0.06	0.87	1.90	2.64	122.1	122
24	I felt I was not as good as other people	2.8	0.15	0.80	1.6	2.3	161.5	130
25	I withdrew from other people	2.72	0.04	0.70	1.47	2.30	160.5	144
26	I had trouble making decisions	2.71	−0.16	0.75	1.66	2.57	174.8	140	32,38
27	I had trouble feeling close to people	2.66	−0.12	0.55	1.41	2.24	153.6	155
28	I felt pessimistic	2.65	−0.30	0.48	1.38	2.23	198.8	155
29	I felt that others would be better off if I were dead	2.6	1.10	1.55	2.4	3.0	70.1	67	13,21,35
30	I felt lonely	2.54	−0.09	0.60	1.45	2.21	186.0	158
31	I felt unloved	2.51	0.26	0.90	1.76	2.48	161.8	136
32	I had trouble thinking clearly	2.51	−0.15	0.78	1.84	2.84	178.7	145	26,38
33	I had mood swings	2.45	−0.32	0.56	1.42	2.32	181.8	153
34	I felt like crying	2.44	0.05	0.82	1.67	2.62	178.5	148	45	43.4	4
35	I thought about suicide	2.43	1.34	1.80	2.37	2.86	74.9	54	13,21,29
36	I felt ignored by people	2.41	−0.07	0.73	1.67	2.55	190.2	150
37	I felt guilty	2.39	0.07	0.86	1.76	2.54	160.8	139
38	I had trouble keeping my mind on what I was doing	2.4	−0.47	0.45	1.7	2.7	187.6	152	26,32
39	I felt that everything I did was an effort	2.3	−0.21	0.60	1.5	2.4	181.3	165
40	My thinking was slower than usual	2.12	−0.22	0.78	2.09	3.11	155.6	139	46
41	I felt slowed down	2.09	−0.48	0.38	1.47	2.55	226.9	168	43,44
42	I felt like being alone	1.99	−0.83	−0.19	1.09	2.37	214.8	172
43	I got tired more easily than usual	1.99	−0.56	0.24	1.37	2.39	216.3	182	41,44
44	I felt that I had no energy	1.99	−0.81	0.15	1.20	2.39	192.4	182	41,43
45	I had crying spells	1.99	0.83	1.49	2.34	3.33	122.0	109	34	34.7	4
46	I reacted slowly to things that were done or said	1.9	−0.18	0.93	2.3	3.3	160.8	143	40
47	I was unable to do many of my usual activities	1.8	0.18	1.08	2.2	3.6	193.7	146
48	I had little desire to eat	1.48	0.29	1.39	2.70	3.86	175.3	151
49	I disliked the way my body looked	1.39	−1.07	−0.31	0.87	1.82	299.4	217		76.4	4
50	I ate more than usual	1.19	−0.54	0.70	2.33	3.73	227.8	180
51	I lost weight without trying	0.57	1.90	4.24	7.03	9.39	151.8	124

Note. Italicized S-Χ² and Χ² values are significant at p < 0.01 after Benjamini-Hochberg correction for multiplicity

LD Local dependence detected with indicated item numbers

The current calibrations are provided for didactic purposes and are not intended to replace the official PROMIS® parameters or to be used for research