Table 3. Comparison of K1/K2 type questions’ distribution and the measured item difficulty between new and the old curricula students’ performance in the MCQs.

Curriculum	n*	Measured Item Difficulty				**p-value
		K1-Items		K2-Items
		n*	Mean ± SD	n*	Mean ± SD
Old	220	144	0.68 ± 0.24	76	0.56 ± 0.26	0.001
New	225	121	0.67 ± 0.26	104	0.64 ± 0.25	0.545
p-value			0.693		0.036

*Number of MCQs; **Student’s t-test for independent samples