Skip to main content

Table 5 DIF summary (gender) for the individual items of the PREE

From: Rasch analysis of the Patient Rated Elbow Evaluation questionnaire

Item

Uniform DIF for Gender

Non-Uniform DIF for Gender

MS

F

DF

P

MS

F

DF

P

Pain sub scale

Pain - When it is at its worst

3.76

4.31

1

0.04

0.88

1.01

3

0.39

Pain - At rest

0.83

1.28

1

0.26

1.00

1.53

3

0.21

Pain - When lifting a heavy object

0.00

0.00

1

0.96

0.10

0.10

3

0.96

Pain - When doing a task with repeated elbow movement

1.58

2.43

1

0.12

0.07

0.11

3

0.95

How often do you have pain?

0.40

0.50

1

0.48

0.50

0.62

3

0.61

Specific activities sub scale

Comb my hair

3.25

4.76

1

0.03

0.29

0.42

3

0.74

Eat with a fork or spoon

0.10

0.14

1

0.71

1.37

1.97

3

0.12

Pull a heavy object

0.00

0.00

1

0.97

0.15

0.19

3

0.90

Use my arm to rise from a chair

1.52

1.77

1

0.19

1.20

1.39

3

0.25

Carry a 10 lb object with my arm at my side

0.11

0.08

1

0.78

0.79

0.60

3

0.61

Throw a small object, such as a tennis ball

3.34

3.35

1

0.07

3.08

3.08

3

0.03

Use a telephone

0.90

0.84

1

0.36

0.53

0.49

3

0.69

Do up buttons on the front of my shirt

0.04

0.04

1

0.84

2.73

2.72

3

0.05

Wash my opposite armpit

0.51

0.67

1

0.41

0.37

0.49

3

0.69

Tie my shoe

0.49

0.47

1

0.49

0.20

0.19

3

0.91

Turn the doorknob and open a door

0.00

0.00

1

0.99

2.11

2.21

3

0.09

Usual activities sub scale

Personal activities (dressing, washing)

0.65

1.03

1

0.31

−0.16

−0.25

2

0.99

Household work (cleaning, maintenance)a

6.68

14.28

1

0.00

−0.06

−0.14

2

0.99

Work (your job or everyday work)

3.24

4.35

1

0.04

0.72

0.97

2

0.38

Recreational activities

3.74

4.61

1

0.03

0.27

0.33

2

0.72

  1. aItems exhibiting Uniform DIF. An item was considered to exhibit DIF if P values are significant after applying Bonferroni correction factor; PREE – Patient Rated Elbow Evaluation