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Table 2 Basic descriptive statistics and parameter estimations based on the 4-dimensional Rasch model of the DKAS-TC

From: Developing a shortened version of the dementia knowledge assessment scale (DKAS-TC) with a sample in Taiwan: an item response theory approach

   

Cronbach’s alpha = .70

Percentage of responses (%)a

Difficulty

  

Information Total Test = 123.809

 

Dimension

Item No.

Item-total correlation

If item deleted alpha

Score

estimate

error

out FIT

In FIT

Value

%

PSR

0

1

2

Cause and characteristics

1

0.33

0.69

51.47

14.95

33.58

0.86

0.12

0.98

1.02

4.97

4.01%

0.74

2

0.29

0.69

5.87

28.12

66.01

−0.83

0.12

1.08

1.02

4.97

4.01%

 

3

0.44

0.68

22.60

29.48

47.91

0.11

0.11

0.9

0.92

4.98

4.02%

 

4

0.36

0.69

21.08

19.12

59.80

−0.49

0.11

1.06

1.04

4.97

4.02%

 

5

0.23

0.69

4.39

8.05

87.56

−2.38

0.16

1.45

1.09

4.88

3.94%

 

6

0.30

0.69

69.46

17.24

13.30

2.29

0.16

0.78

0.97

4.89

3.95%

 

7

0.38

0.69

54.03

17.85

28.12

1.18

0.12

1.01

0.98

4.96

4.01%

 

Risks and health promotion

8

0.48

0.69

30.79

28.82

40.39

0.57

0.12

0.85

0.93

4.97

4.02%

0.81

9

0.41

0.69

21.08

19.12

59.80

−0.54

0.12

1.05

1.04

4.97

4.02%

 

10

0.47

0.68

38.24

29.17

32.60

1.03

0.12

0.97

1.01

4.96

4.01%

 

11

0.43

0.68

5.88

23.53

70.59

−1.22

0.13

0.85

0.93

4.96

4.01%

 

12

0.48

0.68

11.22

16.59

72.20

−1.33

0.13

0.83

0.86

4.96

4.00

 

13

0.20

0.70

82.89

7.82

9.29

3.03

0.19

1.07

1.12

4.78

3.86

 

Communication and behavior

14

0.31

0.69

25.86

29.06

45.07

0.27

0.12

1.24

1.15

4.98

4.02%

0.77

15

0.26

0.69

54.05

18.18

27.76

1.27

0.13

1.08

1.08

4.96

4.00%

 

16

0.43

0.68

25.43

25.18

49.39

0.04

0.11

0.93

0.97

4.98

4.02%

 

17

0.48

0.68

28.61

38.14

33.25

0.94

0.12

0.91

0.97

4.97

4.01%

 

18

0.40

0.69

30.47

37.59

31.94

1.01

0.12

0.96

0.95

4.97

4.01%

 

19

0.34

0.69

48.16

23.59

28.26

1.24

0.13

0.93

1.01

4.96

4.00%

 

Care considerations

20

0.46

0.68

9.11

18.97

71.92

−1.48

0.14

1.13

1.09

4.95

4.00%

0.78

21

0.26

0.69

51.72

23.28

25.00

1.72

0.14

1.12

1.09

4.94

3.99%

 

22

0.55

0.68

10.02

30.81

59.17

−0.58

0.13

1.02

0.88

4.97

4.02%

 

23

0.36

0.69

20.54

29.58

49.88

0.02

0.13

1.01

0.98

4.98

4.02%

 

24

0.58

0.67

22.68

29.76

47.56

0.17

0.13

0.67

0.81

4.98

4.02%

 

25

0.39

0.69

13.20

28.12

58.68

−0.54

0.13

1.11

1.07

4.97

4.02%

 
  1. Abbreviations: PSR person separation reliability
  2. aPercentage of respondents who responded on a three-point scale for each item