Table 1

Item characteristics relating to the themes of professionalism, anatomy or skills from the seven exams taken by the two cohorts attending years I and II of medical school at Durham University

Items

Difficulty (sd) Logits

Discrimination (sd)

Z Infit (sd)

Z Outfit (sd)

Guessing Index (sd)


Anatomy MCQs

.54 (1.2)

1.08 (.3)

-.27 (.8)

-.30 (.9)

.02 (.1)

Anatomy EMQs

-.47 (1.6)

1.07 (.2)

-.17 (.6)

-.35 (.7)

.06 (.2)

Anatomy Combined

-.16 (1.6)

1.08 (.2)

-0.2 (.7)

-.33 (.8)

.05 (.2)

Skills MCQs

-.57 (1.9)

.91 (.3)

.27 (.8)

.38 (1.0)

.11 (.3)

Skills EMQs

-.09 (1.7)

.92 (.2)

.29 (.6)

.33 (.8)

.05 (.2)

Skills Combined

-.35 (1.8)

.92 (.3)

.28 (.7)

.35 (.9)

.08 (.2)

Prof. MCQs

-.38 (2.0)

.81 (.5)

.60 (1.1)

.82 (1.1)

.19 (.3)

Prof. EMQs

-1.47(1.8)

.94 (.2)

.29 (.5)

.34 (.7)

.07 (.2)

Prof. Combined

-1.11( 1.9)

.90 (.3)

.39 (.8)

.50 (.9)

.11 (.3)


The estimates of relative item difficulty, discrimination, standardised "infit"/"outfit" and a "guessing index" are depicted with their respective standard deviations.

Tiffin et al. BMC Medical Education 2011 11:43   doi:10.1186/1472-6920-11-43

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