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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