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Table 4 Response change patterns and outcomes by examinee ability for block 4

From: Investigation of answer changes on the USMLE® Step 2 Clinical Knowledge examination

  High Ability (n = 13,405) Medium Ability (n = 11,917) Low Ability (n = 2508)
Mean number of items % Mean number of items % Mean number of items %
Items with revisits 17.9 40.7% 14.6 33.2% 12.1 27.5%
Items with revisits and no response change 16.5 92.2%a 13.2 90.4%a 10.7 88.4%
Items with revisits and response change 1.4 7.8%a 1.4 9.6%a 1.4 11.6%
W-R 0.63   0.56   0.51  
R-W 0.40   0.39   0.40  
R-R 0.04   0.03   0.03  
W-W 0.33   0.41   0.50  
W-R/R-W ratio 1.58   1.44   1.28  
Mean score change 0.005   0.004   0.003  
  1. W-R wrong to right response changes, R-W right to wrong response changes, W-W wrong to wrong response changes, R-R right to right response changes
  2. aPercentage is calculated based on items with revisits