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

Table 1 Item-wise chi-square tests of model fit (0–2)

Order	Item stem (abbreviated)	X²	df	Probability
17	Feeling down or depressed	53.63	46	0.2045
19	Worry	29.74	45	0.9613
20	Disturbed Sleep	53.44	51	0.3799
22	Listlessness	73.23	46	0.0065
25	Tense	39.48	43	0.6254
26	Easily irritated	32.59	48	0.9566
29	That you just can’t do anything anymore	46.59	40	0.2191
31	(…) take any interest in the people and things around you	41.73	38	0.3113
32	That you can’t cope anymore	31.59	38	0.7598
36	That you can’t face it anymore	52.79	34	0.0209
37	No longer feel like doing anything	64.36	38	0.0048
38	Have difficulty in thinking clearly	39.67	47	0.7677
41	Did you easily become emotional	46.94	48	0.5171
48	(…) to put aside thoughts about any upsetting event(s)	61.17	48	0.0958

ISSN: 1471-244X