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 |