Table 5.

IRT analysis of final 25 items retained in the knowledge section

Item	Difficulty index	Discrimination index	Chi-square value	P
K1
K1.1	−5.24	0.66	10.34	0.242
K1.2	−7.58	0.24	15.34	0.053
K1.3	−3.15	0.36	10.59	0.226
K1.12	1.31	0.61	10.36	0.241
K1.13	1.81	0.73	5.99	0.648
K2	5.52	0.02	2.76	0.948
K3
K3.3	−7.33	0.54	6.36	0.607
K4
K4.1	0.36	7.69	9.34	0.314
K4.2	−5.86	0.44	13.23	0.104
K4.3	0.37	9.37	9.19	0.327
K4.4	0.34	10.66	6.08	0.638
K5
K5.1	−3.68	0.47	43.14	< 0.001
K5.2	0.08	1.93	39.16	< 0.001
K5.3	0.57	1.73	41.63	< 0.001
K5.4	0.48	1.60	44.05	< 0.001
K6
K6.1	−4.67	0.38	11.57	0.172
K6.4	−5.16	0.93	5.25	0.731
K6.6	−3.11	0.38	14.60	0.067
K6.7	−0.63	1.30	40.37	< 0.001
K7	3.29	0.44	4.47	0.813
K8
K8.1	−1.72	0.52	18.09	0.021
K8.2	−3.37	0.65	13.51	0.095
K8.3	0.85	0.26	9.13	0.332
K8.4	0.82	0.93	10.59	0.226
K11	−5.50	0.41	10.56	0.228

Bold values indicate p < 0.05; statistically significant