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Table 2 Diagnostic statistics for DEMQOL (23 items)

From: DEMQOL and DEMQOL-Proxy: a Rasch analysis among those diagnosed with dementia

 

Subsample dementia

Full sample

Item

Location

Fit Residual

ChiSq

p

DIF

Location

Fit Residual

ChiSq

p

DIF

2. Worried or anxious

0.331

1.081

5.84

0.44

ns

0.349

0.886

3.54

0.94

ns

4. Frustrated

0.483

0.338

4.58

0.60

ns

0.546

0.257

2.66

0.98

ns

7. Sad

0.036

− 0.416

4.23

0.65

ns

0.080

−0.255

6.58

0.68

ns

8. Lonely

− 0.238

1.948

19.47

0.00

ns

−0.206

2.222

5.59

0.78

ns

9. Distressed

−0.531

− 0.252

2.31

0.89

ns

−0.391

−2.395

7.04

0.63

ns

11. Irritable

0.050

0.497

3.16

0.79

ns

0.007

0.361

1.66

1.00

ns

12. Fed-up

0.489

0.192

3.69

0.72

ns

0.425

0.361

2.20

0.99

ns

13. Things you wanted but couldn’t

0.735

2.408

21.20

0.00

ns

0.829

4.077

12.51

0.19

ns

14. Forgetting happened recently

0.673

−0.974

11.45

0.08

ns

0.654

−1.100

4.43

0.88

ns

15. Forgetting who people are

0.018

−0.207

6.34

0.39

ns

−0.043

2.511

6.68

0.67

ns

16. Forgetting what day it is

0.375

1.342

5.28

0.51

ns

0.135

4.339

11.45

0.25

ns

17. Thoughts being muddled

0.280

−1.107

11.45

0.08

ns

0.126

−2.376

8.27

0.51

ns

18. Difficulty making decisions

−0.123

−1.527

8.23

0.22

ns

−0.103

− 2.777

8.08

0.53

ns

19. Poor concentration

0.305

−2.557

16.96

0.01

ns

0.298

−2.338

6.86

0.65

ns

20. Not having enough company

−0.468

1.750

16.53

0.01

ns

−0.415

−0.981

5.01

0.83

ns

21. Get on with people close to you

−0.366

−2.134

10.65

0.10

ns

−0.422

−1.291

5.21

0.82

ns

22. Getting the affection you want

−0.564

−1.112

6.15

0.41

ns

−0.525

0.328

6.63

0.68

ns

23. People not listening to you

−0.635

0.290

5.56

0.47

ns

−0.479

−0.989

5.73

0.77

ns

24. Making yourself understood

−0.319

−1.278

6.88

0.33

PWD sex

−0.337

−1.792

4.27

0.89

ns

25. Getting help when needed

−0.466

−1.278

11.54

0.07

ns

−0.511

−2.833

5.07

0.83

ns

26. Getting to the toilet in time

−0.202

1.596

16.87

0.01

ns

−0.267

3.543

17.96

0.04

ns

27. How you feel in yourself

0.011

−2.538

16.88

0.01

ns

0.016

−4.440

14.24

0.11

ns

28. Overall health

0.125

−0.816

5.74

0.45

ns

0.232

−1.848

6.27

0.71

ns

  1. Note. Fit residuals in bold are outside the acceptable range of +/− 2.5. Location = average item threshold location (logit). ChiSq = chi square value; p = chi square probability. DIF = differential item functioning; ns = non-significant. None of the chi square tests is statistically significant at familywise α = 0.01 (Bonferroni-corrected: p < 0.000435)