Table 3.

Results of IRT analysis of the knowledge section

Item	Percentage correct response	Difficulty index	Discrimination index	Chi-square value	P
K1.1	0.96	−5.24	0.66	10.34	0.242
K1.2	0.86	−7.58	0.24	15.34	0.053
K1.3	0.74	−3.15	0.36	10.59	0.226
K1.4	0.85	−4.65	0.39	18.65	0.017
K1.5	0.81	−2.79	0.59	31.00	< 0.001
K1.6	0.69	−2.37	0.36	25.69	0.001
K1.7	0.43	0.70	0.35	35.38	< 0.001
K1.8	0.40	0.82	0.45	47.58	< 0.001
K1.9	0.21	10.1	0.13	38.56	< 0.001
K1.10	0.54	−1.20	0.15	16.91	0.031
K1.11	0.61	−2.48	0.20	17.69	0.024
K1.12	0.31	1.31	0.61	10.36	0.241
K1.13	0.22	1.81	0.73	5.99	0.648
K1.14	0.29	1.95	0.45	23.00	0.003
K1.15	0.49	0.01	0.21	17.71	0.023
K1.16	0.36	3.07	0.18	18.96	0.015
K1.17	0.38	2.27	0.20	16.01	0.042
K2	0.47	5.52	0.02	2.76	0.948
K3.1	0.56	−0.27	2.62	27.21	0.001
K3.2	0.58	−0.34	2.27	28.72	< 0.001
K3.3	0.98	−7.33	0.54	6.36	0.607
K4.1	0.31	0.36	7.69	9.34	0.314
K4.2	0.92	−5.86	0.44	13.23	0.104
K4.3	0.30	0.37	9.37	9.19	0.327
K4.4	0.31	0.34	10.66	6.08	0.638
K5.1	0.83	−3.68	0.47	43.14	< 0.001
K5.2	0.44	0.08	1.93	39.16	< 0.001
K5.3	0.31	0.57	1.73	41.63	< 0.001
K5.4	0.34	0.48	1.60	44.05	< 0.001
K6.1	0.84	−4.67	0.38	11.57	0.172
K6.2	0.96	−6.95	0.47	22.44	0.004
K6.3	0.44	1.29	0.17	25.46	0.001
K6.4	0.99	−5.16	0.93	5.25	0.731
K6.5	0.94	−4.28	0.70	24.84	0.002
K6.6	0.75	−3.11	0.38	14.60	0.067
K6.7	0.62	−0.63	1.30	40.37	< 0.001
K6.8	0.74	32.21	-0.03	18.06	0.021
K7	0.19	3.29	0.44	4.47	0.813
K8.1	0.68	−1.72	0.52	18.09	0.021
K8.2	0.87	−3.37	0.65	13.51	0.095
K8.3	0.44	0.85	0.26	9.13	0.332
K8.4	0.32	0.82	0.93	10.59	0.226
K10	0.66	−3.96	0.17	17.33	0.027
K11	0.90	−5.50	0.41	10.56	0.228

Bold values indicate p < 0.05; statistically significant