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Table 1 Individual Item difficulty (location) and Tests of Fit (residuals and chi-square and its probability) for the 25 musculoskeletal EMQs.

From: Using item response theory to explore the psychometric properties of extended matching questions examination in undergraduate medical education

Question Location SE Residual ChiSq DF Prob
OR63 -2.68 0.47 -0.60 0.06 1 0.81
OR64 -2.32 0.40 -0.67 0.43 1 0.51
OR65 -2.03 0.35 -1.02 0.96 1 0.33
OR66 1.03 0.15 2.48 1.85 1 0.17
OR67 -2.27 0.39 -1.12 2.32 1 0.13
OR68 1.74 0.16 0.20 0.02 1 0.88
OR69 -0.29 0.19 -0.79 0.52 1 0.47
OR70 -3.49 0.68 -0.25 0.59 1 0.44
OR71 0.81 0.16 1.62 1.19 1 0.28
OR72 -1.66 0.30 -0.52 0.44 1 0.51
OR73 -0.48 0.20 0.21 0.47 1 0.49
OR74 1.79 0.16 1.64 7.80 1 0.01
OR75 0.12 0.17 -0.64 0.33 1 0.57
OR76 1.70 0.16 -0.71 3.90 1 0.05
OR77 1.12 0.15 -0.52 2.95 1 0.09
OR78 1.20 0.15 1.76 0.08 1 0.78
RH79 -1.47 0.28 -0.61 1.00 1 0.32
RH80 1.57 0.15 -1.00 2.01 1 0.16
RH81 0.22 0.17 1.52 4.22 1 0.04
RH82 1.11 0.15 1.01 0.00 1 0.96
RH83 -1.08 0.24 -0.58 0.43 1 0.51
RH84 2.08 0.16 -0.18 0.09 1 0.76
RH85 1.50 0.15 -0.12 0.00 1 0.99
RH86 1.78 0.16 -0.88 3.28 1 0.07
  1. OR** representing Orthopaedic EMQ
  2. RH** representing Rheumatology EMQ
  3. ChiSq Chi – squared statistic
  4. SE Standard error
  5. Location Value identifies question difficulty on logit scale
  6. Residual Fit of question to underlying trait
  7. DF Degrees of freedom