TABLE 2.

The results of IRT model in evaluating the psychometric property of cTEQ (n = 648).

	Discrimination	Threshold indices				S-χ 2	p-value	Test information (%, range)
	a	b1	b2	b3	b4			−6 ∼ 6	−6 ∼ 0	0 ∼ 6
Item 1	0.73	–2.89	–3.24	0.72	3.25	62.29	0.26	96.05	65.47	30.58
Item 2	0.54	–3.55	–2.43	1.72	4.74	79.02	0.07
Item 3	0.8	–3.61	–2.76	–0.26	2.6	60.96	0.27
Item 4	0.79	–3.96	–2.54	–2.03	1.14	69.86	0.05
Item 5	1.36	–2.53	–2.88	–1.04	1.11	52.41	0.09
Item 6	1.15	–2.28	–2.86	–0.48	1.59	43.16	0.59
Item 7	0.19	–7.18	–6.55	0.57	8.96	59.39	0.76
Item 8	1.06	–2.75	–2.99	–0.7	1.73	52.0	0.25
Item 9	0.9	–3.46	–3.25	–0.9	1.71	73.56	0.01
Item 10	0.37	–4.51	–2.86	0.73	3.39	84.07	0.16
Item 11	0.41	–5.22	–3.91	0.29	4.15	89.94	0.02
Item 12	1.3	–3.02	–2.31	–1.05	1.57	56.13	0.14
Item 13	1.64	–3.17	–1.73	0.05	1.85	52.45	0.13
Item 14	0.48	–3.08	–2.23	–2.46	2.68	146.3	0
Item 15	0.7	–3.24	–3.5	–2.22	–0.57	58.74	0.056
Item 16	1.26	–2.72	–2.53	–0.16	1.6	47.24	0.42

b, difficulty; b1 is the threshold between option 1 and 2; b2 is the threshold between option 2 and 3; b3 is the threshold between option 3 and 4; b4 is the threshold between option 4 and 5.