Table 2.

Item analysis on the total sample.

Item	Mean	SD	Skew	Item difficulty	Item discrimination	α if deleted
1	2.57	0.93	− 0.42	0.64	0.69	0.97
2	2.60	0.98	− 0.54	0.65	0.63	0.97
3	1.59	1.18	0.23	0.40	0.41	0.97
4	2.33	0.96	− 0.24	0.58	0.79	0.97
5	2.25	0.98	− 0.19	0.45	0.81	0.97
6	2.24	0.98	− 0.17	0.56	0.78	0.97
7	2.15	0.98	− 0.07	0.54	0.81	0.97
8	2.27	0.97	− 0.19	0.57	0.78	0.97
9	2.40	0.94	− 0.26	0.60	0.74	0.97
10	2.45	0.95	− 0.36	0.61	0.79	0.97
11	2.28	0.96	− 0.21	0.57	0.84	0.97
12	2.30	0.96	− 0.23	0.58	0.81	0.97
13	2.44	0.98	− 0.34	0.61	0.73	0.97
14	2.28	0.96	− 0.19	0.57	0.82	0.97
15	2.00	1.08	− 0.04	0.50	0.78	0.97
16	2.21	1.00	− 0.19	0.55	0.81	0.97
17	2.16	1.03	− 0.17	0.54	0.82	0.97
18	2.09	1.00	− 0.07	0.52	0.81	0.97
19	2.34	0.96	− 0.31	0.59	0.80	0.97
20	1.92	1.04	0.03	0.48	0.68	0.97
21	2.07	1.02	− 0.11	0.52	0.78	0.97
22	2.32	0.99	− 0.30	0.58	0.78	0.97
23	1.80	1.09	0.12	0.45	0.72	0.97
24	2.15	1.04	− 0.20	0.54	0.78	0.97
25	2.08	1.06	− 0.14	0.52	0.75	0.97