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Table 2 Item difficulty level and item-total correlations for the Key Features (KF) test.

From: An innovative method to assess clinical reasoning skills: Clinical reasoning tests in the second national medical science Olympiad in Iran

  KF1 KF2 KF3 KF4 KF5 KF6 KF7 KF8 KF9 KF10
Item difficulty level 0.52 0.66 0.66 0.76 0.77 0.69 0.69 0.79 0.71 0.71
Item-total correlation 0.51 0.38 0.53 0.30 0.33 0.59 0.50 0.37 0.39 0.28
  KF11 KF12 KF13 KF14 KF15 KF16 KF17 KF18 KF19 KF20
Item difficulty level 0.70 0.74 0.72 0.66 0.78 0.57 0.64 0.61 0.76 0.53
Item-total correlation 0.33 0.37 0.38 0.49 0.49 0.59 0.14 0.56 0.54 0.49