Table 1

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

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


OR** representing Orthopaedic EMQ

RH** representing Rheumatology EMQ

ChiSq Chi – squared statistic

SE Standard error

Location Value identifies question difficulty on logit scale

Residual Fit of question to underlying trait

DF Degrees of freedom

Bhakta et al. BMC Medical Education 2005 5:9   doi:10.1186/1472-6920-5-9

Open Data