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Table 3 Item Performance Characteristics Based on Different Item Properties and Layers (N = 173)

From: Evaluation of the effect of items’ format and type on psychometric properties of sixth year pharmacy students clinical clerkship assessment items

 Level of Difficulty Mean (SD)Discriminating Index Mean (SD)Point-biserial Mean (SD)
Item Format
 Case Based63.7 (19.7).34 (.18)0.34 (.17)
 Noncase Based59.2 (19)NS.38 (.22)NS0.30 (.16)NS
Item Type/Structure
 Open-ended/Essay63.4 (18).39 (.18).39 (.15)
 Multiple Choice61.7 (21.5)NS.31 (.19)*.26 (.16)*
Number of Choices/options
 4-option Items51.3 (19.1).30 (.18).24 (.14)
 5-option Items67.2 (21.5)*.31 (.19)NS.29 (.17)NS
Item Format: Item Type/Structure
 Case Based: Open-ended64.5 (18.3).37 (.17).38 (.16)
 Case Based: MCQs62.2 (22.2)NS.29 (.17)*.26 (.15)*
 Noncase Based: Open-ended54.2 (11.7).54 (.17).45 (.07)
 Noncase Based: MCQs61 (20.8)NS.33 (.21)*.25 (.18)*
Item Format: Number of Choices/options
 Case Based: 4-option50.3 (20.4).3 (.17).25 (.13)
 Case Based: 5-option73.7 (18.8)*.27 (.16)NS.29 (.17)NS
 Noncase Based: 4-option53.5 (16.6).33 (.22).21 (.17)
 Noncase Based: 5-option59 (22.6)*.36 (.23) NS.28 (.19)NS
Item Type/Structure: Item Format
 Open-ended: Case Based64.5 (18.3).37 (.17).38 (.16)
 Open-ended: Noncase Based54.2 (11.8)NS.54 (.17)*.45 (.07)*
 MCQ: Case Based62.2 (22.2).29 (.1).20 (.1)
 MCQ: Noncase Based61 (20.8)NS.33 (.1)*.26 (.1)*
Number of Choices/options: Item Format
 4-option: Case Based50.3 (20).3 (.17).25 (.13)
 4-option: Noncase Based53.6 (17)*.33 (.22)NS.21 (.17)NS
 5-option: Case Based73.7 (18.8).27 (.16).29 (.17)
 5-option: Noncase Based60 (22.5)*.36 (.23)NS.28 (.16)NS
  1. NS Not Significant
  2. * Significant at measurement level