TABLE 1.

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

	Alpha#	Average inter-item correlation	Item-total correlation	Test–retest reliability	Mean	SD	Skewness	Floor effect	Ceiling effect
Overall	0.81			0.78	42.28	6.62	–0.04
Item 1	0.80	0.2	0.48	0.64	2.3	0.75	–0.13	1.70	5.25
Item 2	0.80	0.18	0.45	0.55	2.1	0.81	–0.19	3.55	2.78
Item 3	0.80	0.21	0.49	0.24	2.5	0.79	–0.29	0.93	9.10
Item 4	0.80	0.22	0.52	0.29	3.0	0.78	–0.78	0.46	27.16
Item 5	0.79	0.27	0.59	0.32	2.9	0.75	–0.52	0.62	21.45
Item 6	0.89	0.26	0.59	0.43	2.7	0.8	–0.39	1.23	14.81
Item 7	0.82	0.09	0.31	0.34	2.3	0.89	–0.36	3.24	6.94
Item 8	0.80	0.25	0.55	0.44	2.8	0.76	–0.39	0.77	14.51
Item 9	0.80	0.22	0.5	0.63	2.8	0.76	–0.34	0.46	16.67
Item 10	0.81	0.16	0.44	0.20	2.3	0.97	–0.16	3.55	10.34
Item 11	0.81	0.16	0.42	0.42	2.4	0.84	–0.21	1.54	8.33
Item 12	0.79	0.29	0.65	0.24	2.8	0.74	–0.65	0.62	15.12
Item 13	0.79	0.3	0.66	0.54	2.5	0.8	–0.07	0.62	8.49
Item 14	0.80	0.18	0.47	0.31	2.8	0.92	–0.93	2.62	17.44
Item 15	0.80	0.21	0.5	0.50	3.4	0.77	–1.23	0.46	53.09
Item 16	0.79	0.27	0.61	0.45	2.6	0.8	–0.15	0.93	13.12

^#For overall, the alpha represents the internal reliability of the scale; for each item, alpha represents the alpha if the item was dropped. SD, standard deviation; ICC, intraclass correlation coefficient.