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Table 5 Results of testing for gender bias and estimated item parameters (standard error in italics) and item fit for females and males

From: Dimensionality and scale properties of the Edinburgh Depression Scale (EDS) in patients with type 2 diabetes mellitus: the DiaDDzoB study

Item

DIF

Estimated Item Parameters

Item Fit1

 

Slopes and

Thresholds

equal

Slopes

Equal

Thresholds

equal

Females(n= 828)

Males(n= 828)

 
 

χ 2 (4)

χ 2 (1)

χ 2 (3)

a

b 1

b 2

b 3

a

b 1

b 2

b 3

p- value

1

7.6

0.8

6.8

1.46

0.81

1.92

2.74

1.46

0.81

1.92

2.74

.540

    

.09

.07

.14

.20

.09

.07

.14

.20

 

2

2.0

  

1.45

0.71

1.88

2.27

1.45

0.71

1.88

2.27

.794

    

.08

.07

.14

.16

.08

.07

.14

.16

 

3

24.1**

2.3

21.9

1.35

-0.73

0.58

2.84

1.08

-1.41

0.46

3.34

.048/.360

    

.10

.10

.09

.25

.10

.13

.12

.41

 

4

15.8*

0.1

15.7

1.52

-0.53

0.42

2.96

1.53

-0.48

0.70

2.84

.000/.202

    

.12

.09

.08

.26

.13

.08

.10

.30

 

5

11.9

0.1

11.8

1.92

-0.40

0.95

2.36

1.92

-0.40

0.95

2.36

.132

    

.10

.05

.06

.14

.10

.05

.06

.14

 

6

1.2

  

2.08

-0.62

1.04

2.49

2.08

-0.62

1.04

2.49

.746

    

.11

.05

.06

.14

.11

.05

.06

.14

 

7

6.3

0.7

5.6

2.47

0.01

0.98

2.38

2.47

0.01

0.98

2.38

.774

    

.13

.04

.05

.13

.13

.04

.05

.13

 

8

5.9

1.1

4.8

2.68

-0.03

1.50

2.58

2.68

-0.03

1.50

2.58

.686

    

.15

.04

.07

.15

.15

.04

.07

.15

 

9

95.0**

-0.0

95.0

2.03

0.41

2.26

3.12

2.04

1.14

2.70

3.79

.464 /.052

    

.17

.06

.16

.30

.26

.11

.31

.75

 

10

9.0

0.3

8.7

1.88

1.90

2.56

3.67

1.88

1.90

2.56

3.67

.718

    

.21

.13

.19

.37

.21

.13

.19

.37

 
  1. Note.
  2. 1 Reported p-values are based on 500 bootstrap replications.
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