Table 3.

Item analysis of the final test (120 items)

CC indicator	Number of items	Balance between true and false answers		Difficulty index		Discrimination index		Inter-item correlation		Cronbach's α
Ideal value	NA	‘True’ statements 50 %	‘False’ statements 50 %	0⋅2–0⋅8		≥0⋅20		≥0⋅15		≥0⋅70
				Mean	SD	Mean	SD	Mean	SD
Identification of risk factors for CKD	14	6 (43 %)	8 (57 %)	0⋅50	0.19	0⋅18	0.16	0⋅15	0.12	0⋅54
Diagnosis integration	40	17 (43 %)	23 (57 %)	0⋅60	0.24	0⋅28	0.15	0⋅20	0.11	0⋅66
Adequate use of therapeutic resources	32	17 (53%)	15 (47%)	0.67	0.23	0.26	0.12	0.20	0.10	0.63
Iatrogenesis recognition	34	14 (41 %)	20 (59 %)	0⋅63	0.18	0⋅29	0.14	0⋅21	0.10	0⋅66
Global CC (whole test)	120	54 (45 %)	66 (55 %)	0⋅61	0.22	0⋅26	0.15	0⋅19	0.11	0⋅85

NA, not applicable; CC, clinical competence; CKD, chronic kidney disease; SD, standard deviation.

Data are shown as mean ± standard deviation.