Table 2

Difficulty, SE, DIF and fit statistics for the 21-item Patient Feedback Questionnaire

Difficulty

SE

Classified groups for DIF

MNSQ

Logits

Logits

Gender

Education

Age

Disease

Outfit

Infit


Interpersonal skills

2

0.27

0.10

0.05

0.08

0.36

0.63*

1.05

1.05

4

0.17

0.11

0.00

0.04

0.50

0.35

0.82

0.80

3

-0.01

0.10

0.06

0.01

1.46*

0.38

1.11

1.09

1

-0.11

0.10

0.06

0.08

0.95*

0.34

0.98

1.01

5

-0.52

0.10

0.04

0.08

0.70*

0.34

0.85

0.85

Communication of information

9

0.51

0.10

0.10

0.08

0.73*

0.14

0.81

0.84

8

0.22

0.10

0.08

0.13

1.09*

0.44

0.90

0.86

6

0.01

0.10

0.13

0.05

0.60*

0.15

0.95

0.90

7

0.00

0.10

0.08

0.06

0.33

0.36

0.88

0.84

Patient engagement and enablement

9

0.52

0.10

0.06

0.03

0.76*

0.50

1.24

1.24

6

0.3

0.10

0.06

0.09

0.74*

0.75*

0.83

0.80

7

0.1

0.10

0.04

0.04

0.57*

0.34

1.05

1.10

15

0.03

0.10

0.04

0.17

1.25*

0.65*

1.18

1.11

16

-0.13

0.10

0.24

0.09

0.54*

0.31

0.76

0.69

14

-0.21

0.10

0.23

0.19

1.07*

0.77*

1.30

1.22

8

-0.3

0.10

0.00

0.12

0.36

0.19

1.00

0.89

Overall satisfaction

19

-0.06

0.10

0.11

0.10

0.47

0.24

1.22

1.10

17

-0.26

0.10

0.14

0.02

0.80*

0.33

1.04

1.10

18

-0.69

0.11

0.09

0.05

0.37

0.59*

0.83

0.76

Technical competence

21

0.27

0.10

0.08

0.08

0.84*

0.59*

1.14

1.12

20

-0.13

0.10

0.03

0.05

0.21

0.85*

1.02

0.95

MEAN

0.00

0.10

0.08

0.08

0.70

0.44

1.00

0.97

S.D.

0.30

0.00

0.06

0.05

0.33

0.21

0.16

0.15


Note: *Substantial DIF (a difference in item difficulties larger than 0.5 logits between groups); Gender: 1 = Male, 2 = Female; Education: 1 = Elementary, 2 = Secondary, 3 = Higher education; Age: 1 = 20–29, 2 = 30–39, 3 = 40–49, 4 = 50–59, 5 = Over 60; Disease: 1 = Internal medicine, 2 = Surgical medicine, 3 = Obstetrics & Gynecology, 4 = Pediatric medicine, 5 = Others.

Chien et al. BMC Medical Research Methodology 2009 9:38   doi:10.1186/1471-2288-9-38

Open Data