Table 1 Distribution of single best answer (SBA) items by difficulty and discrimination levels: frequencies and percentages (42 SBAs)
IA parameter | Item Difficulty | ||||
|---|---|---|---|---|---|
0.71–1 | 0.3–0.7 | < 0.3 | |||
Easy | Moderate | Difficult | |||
Item Discrimination | ≥ 0.4 | Very good | 12 (28.6%) | 4 (9.5%) | 0 |
0.21 to 0.39 | Good | 13 (30.9%) | 5 (11.9%) | 1 (2.4%) | |
0–0.2 | Poor | 1 (2.4%) | 1 (2.4%) | 1 (2.4%) | |
Negative | Negative | 0 | 0 | 4 (9.5%) | |