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Table 8 Response category (rating scale) diagnostics based on Linacre’s criteria: the ASCOT-Proxy-person

From: Feasibility, validity and reliability of the ASCOT-Proxy and ASCOT-Carer among unpaid carers of people living with dementia in England

Scale category

Observed count

% of counts

Observed average

OUTFIT MNSQ

Rasch-Andrich Threshold

Category measure

Food and drink

 High-level of unmet needs

1

0

-0.10

1.00

NONE

-4.78

 Some unmet needs

31

10

0.18

1.36

-2.27

-2.12

 No unmet needs

63

21

0.71

1.43

1.04

-0.21

 Ideal state

212

69

1.41

1.00

1.24

1.33

Accommodation cleanliness and comfort

 High-level of unmet needs

1

0

0.12

1.57

NONE

-4.15

 Some unmet needs

13

4

-0.20

0.94

-1.39

-2.24

 No unmet needs

61

20

0.51

0.92

0.23

-0.73

 Ideal state

234

76

1.39

0.94

1.17

0.96

Personal cleanliness and comfort

 High-level of unmet needs

1

0

-0.10

1.25

NONE

-4.14

 Some unmet needs

13

4

-0.33

0.83

-1.42

-2.28

 No unmet needs

75

24

0.49

0.72

0.00

-0.67

 Ideal state

222

71

1.46

0.93

1.41

1.19

Personal safety

 High-level of unmet needs

12

4

0.29

1.86

NONE

-2.49

 Some unmet needs

38

12

0.04

0.81

-.84

-0.89

 No unmet needs

76

25

0.95

1.12

0.17

0.28

 Ideal state

182

59

1.51

1.06

0.67

1.76

Social participation and involvement

 High-level of unmet needs

67

22

0.24

0.97

NONE

-1.06

 Some unmet needs

88

28

1.03

1.11

-0.89

0.53

 No unmet needs

89

29

1.31

1.15

-0.06

1.81

 Ideal state

66

21

2.03

1.69

0.95

3.45

Occupation

 High-level of unmet needs

81

26

0.19

0.79

NONE

-0.89

 Some unmet needs

107

35

0.91

0.57

-1.14

0.84

 No unmet needs

77

25

1.75

0.56

0.08

2.23

 Ideal state

45

15

2.46

0.85

1.06

3.90

Control over daily life

 High-level of unmet needs

92

30

0.28

0.82

NONE

-0.59

 Some unmet needs

73

24

0.85

0.86

-0.49

0.79

 No unmet needs

78

25

1.59

0.64

-0.22

1.89

 Ideal state

65

21

2.23

0.79

0.71

3.41

Dignity

 High-level of unmet needs

24

8

0.02

1.07

NONE

-2.18

 Some unmet needs

86

30

0.85

1.56

-1.59

-0.23

 No unmet needs

114

39

1.28

1.21

0.02

1.51

 Ideal state

67

23

1.62

1.39

1.58

3.45

  1. We evaluated the functionality of the ASCOT-Proxy-person 4-point rating scale using criteria proposed by Linacre: 1. the occurrence of more than 10 endorsements per response category, 2. the observation that both average measures and category thresholds increase across each response category, and 3. an observed OUTFIT MNSQ value of less than 2 for each response category [38]. Items highlighted in bold did not meet this criteria.
  2. Abbreviations: MNSQ Mean square