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Table 2 Item fit for DEMQOL-23 and DEMQOL-Proxy 26 items

From: Proxy reporting of health-related quality of life for people with dementia: a psychometric solution

Item

Location

SE

FitResid

DF

ChiSq

DF

Prob

p- worried or anxious (common)

0.541

0.026

−2.072

2284.74

1.415

9

0.998

p- Frustrated (common)

0.748

0.025

−3.001

2271.34

8.143

9

0.520

P- Sad (common)

0.264

0.027

−2.393

2270.38

22.499

9

0.007

p- lonely

−0.024

0.037

3.439

1323.75

4.577

9

0.870

p- Distressed (common)

−0.231

0.028

−5.489

2265.60

4.497

9

0.880

p- Irritable (common)

0.190

0.028

−0.654

2275.17

3.006

9

0.964

p- fed up (common)

0.617

0.026

−1.061

2269.43

8.435

9

0.491

p- wanted to do things but couldn’t

1.043

0.032

4.251

1320.88

6.899

9

0.648

p- forgetting things happened recently (common)

0.854

0.026

−1.588

2288.57

17.075

9

0.048

p- forgetting people

0.145

0.035

2.811

1328.54

5.283

9

0.809

P forgetting the day (common)

0.331

0.025

3.742

2289.53

7.56

9

0.579

p- thoughts being muddled (common)

0.305

0.026

−7.016

2281.87

9.364

9

0.404

p- difficulty making decisions (common)

0.072

0.026

−4.921

2287.61

11.869

9

0.221

p- poor concentration

0.487

0.035

−2.185

1323.75

3.52

9

0.940

p- not enough company (common)

−1.211

0.064

−1.069

2281.87

11.387

9

0.250

p- getting on with people close

−0.914

0.084

−2.711

1322.79

8.098

9

0.524

p- getting the affection needed

−1.312

0.096

−1.854

1321.84

4.958

9

0.838

p- people not listening

−0.328

0.041

0.141

1317.05

2.279

9

0.986

p- making self understood (common)

−0.175

0.028

−0.929

2225.40

2.015

9

0.991

p- getting help when needed

−1.114

0.089

−3.693

1318.01

8.816

9

0.454

p- getting to the toilet in time

−0.889

0.083

−1.079

1319.92

1.479

9

0.997

p- how you feel in yourself

0.187

0.037

−4.092

1316.09

7.078

9

0.629

p- your overall health

0.417

0.035

−1.204

1323.75

1.280

9

0.998

c-memory in general

0.639

0.043

−0.236

954.29

1.074

9

0.999

c-forgetting things that happened long ago

−0.421

0.042

2.948

961.95

5.120

9

0.824

c- forgetting names

0.662

0.040

0.444

959.07

1.387

9

0.998

c-forgetting where s/he is

−0.811

0.046

−1.545

955.25

4.321

9

0.889

c-keeping him/herself clean

−1.640

0.100

−0.695

963.86

1.383

9

0.998

c-keeping him/herself looking nice

−1.529

0.097

−0.478

960.99

2.217

9

0.988

c-getting things from the shops

−0.454

0.041

−1.378

950.46

1.497

9

0.997

c-using money to pay

−1.295

0.091

−2.863

951.42

7.185

9

0.618

c-looking after finances

−0.254

0.038

0.496

940.89

3.265

9

0.953

c-things taking longer

0.393

0.040

−4.000

958.12

6.425

9

0.697

c-getting in touch with people

−0.442

0.042

−2.453

951.42

3.275

9

0.952

c-not being able to help others

−0.425

0.041

−0.035

955.25

2.428

9

0.983

c-not playing a useful part

−0.205

0.040

−2.939

956.20

3.651

9

0.933

c-his/her physical health

0.363

0.039

1.180

960.99

2.376

9

0.984

  1. Key: Items denoted p-(item) are unique to DEMQOL and self-reported by the person with dementia; items denoted p-(item) (common) are in both questionnaires, but in this analysis the data from the self-reported DEMQOL was used; items denoted c (item) are unique to DEMQOL-Proxy and reported by the carer
  2. Note Fit residuals in blue are outside the acceptable range of +/− 2.5. Location = average item threshold location (logit). ChiSq = chi square value (comparing observed with expected values); p = chi square probability
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Health and Quality of Life Outcomes

ISSN: 1477-7525

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