Searching for the optimal number of response alternatives for the distress scale of the four-dimensional symptom questionnaire

Table 2 Item-wise chi-square tests of model fit (0–4)

Order	Item stem (abbreviated)	Χ²	df	Probability
17	Feeling down or depressed	161.66	144	0.1490
19	Worry	144.45	143	0.4509
20	Disturbed Sleep	203.09	169	0.0377
22	Listlessness	177.70	145	0.0335
25	Tense	133.39	136	0.5478
26	Easily irritated	134.17	150	0.8186
29	That you just can’t do anything anymore	132.26	121	0.2278
31	(…) take any interest in the people and things around you	155.47	121	0.0189
32	That you can’t cope anymore	123.85	115	0.2696
36	That you can’t face it anymore	173.99	113	0.0002
37	No longer feel like doing anything	153.52	116	0.0112
38	Have difficulty in thinking clearly	131.36	152	0.8857
41	Did you easily become emotional	191.04	156	0.02
48	(…) to put aside thoughts about any upsetting event(s)	189.36	173	0.1870

ISSN: 1471-244X