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Table 4 Percentage of flaws, difficulty and discrimination indices by content area

From: Do item-writing flaws reduce examinations psychometric quality?

 

Total

items

Flawed

N (%)

Difficulty Index

Discrimination Index

Mean

SD

Mean

SD

Total

800

446 (55.8)

    

Content area

 Abdomen

148

68 (45.9)

0.65

0.19

0.32

0.17

 Pelvis and perineum

142

86 (60.6)

0.66

0.20

0.36

0.17

 Upper limb

71

34 (47.9)

0.63

0.20

0.39

0.14

 Lower limb

70

37 (52.9)

0.59

0.21

0.38

0.17

 Neck

123

65 (52.8)

0.57

0.21

0.34

0.16

 Thorax

139

90 (64.7)

0.63

0.21

0.29

0.14

 Head

86

47 (54.7)

0.60

0.21

0.36

0.15

 Imagiology

21

19 (90.5)

0.52

0.21

0.32

0.10

p value

 

<0.001

0.001

 

<0.001