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Table 5 Performance of the WHOQOL-BREF domains after Rasch model adjustment (sub-sample (for validation) size, n = 300)

From: Psychometric evaluation of an interview-administered version of the WHOQOL-BREF questionnaire for use in a cross-sectional study of a rural district in Bangladesh: an application of Rasch analysis

WHOQOL-BREF Scale

Modified instrument

Summary of overall model fit statistics for each domain (modified instrument)

Location

S. E.

Residual

χ2

p-value

Overall

 Overall QOL

−0.04

0.12

−1.29

2.50

0.645

  

 General Health

0.04

0.12

−1.30

4.41

0.353

  

Physical domain

 Pain (3)

−1.41

0.09

−0.85

5.39

0.250

Person separation index

0.773

 Dependence on medical aids (4)

−1.99

0.10

0.87

8.15

0.086

Coefficient alpha

0.790

 Energy (10)

1.36

0.09

0.95

5.45

0.244

Chi-square (Degrees of freedom)

36.47 (20)

 Mobility (15)

0.27

0.09

−1.35

10.64

0.031

p-value

0.0135

 Sleep and rest (16)a

     

Items fit residual (mean (SD))

−0.31 (1.12)

 Activities of daily living (17)

1.76

0.10

−1.15

6.84

0.145

Persons fit residual (mean (SD))

−0.52 (1.09)

 Work capacity (18) a

       

Psychological domain

 Positive feeling (5)

0.46

0.10

−0.07

5.23

0.265

Person separation index

0.708

 Personal belief (6) a

     

Coefficient alpha

0.745

 Concentration (7)

−0.46

0.09

−1.77

8.15

0.086

Chi-square (Degrees of freedom)

28.30 (16)

 Bodily image (11)

0.36

0.10

0.72

9.89

0.042

p-value

0.029

 Self-esteem (19)

−0.35

0.11

0.77

5.03

0.284

Items fit residual (mean (SD))

−0.09 (1.18)

 Negative feeling (26) a

     

Persons fit residual (mean (SD))

−0.30 (0.86)

Social domain

 Personal relationship (20)

−0.77

0.10

−1.59

14.05

0.007

Person separation index

0.635

 Sexual activity (21)

−0.55

0.09

−0.84

10.08

0.039

Coefficient alpha

0.669

 Social support (22)

1.32

0.09

0.71

18.96

0.001

Chi-square (Degrees of freedom)

43.09 (12)

      

p-value

0.000

      

Items fit residual (mean (SD))

−0.57 (1.18)

      

Persons fit residual (mean (SD))

−0.38 (0.72)

Environmental domain

 Security (8)

−0.88

0.09

−0.05

12.24

0.016

Person separation index

0.804

 Physical environment (9)

−0.22

0.09

0.77

4.47

0.346

Coefficient alpha

0.820

 Financial support (12)

0.60

0.08

−1.97

10.48

0.033

Chi-square (Degrees of freedom)

36.97 (20)

 Accessibility of information (13)

0.79

0.09

−1.09

5.33

0.255

p-value

0.0117

 Leisure activity (14)

−0.28

0.08

1.23

4.46

0.347

Items fit residual (mean (SD))

−0.22 (1.32)

 Home environment (23) a

     

Persons fit residual (mean (SD))

−0.46 (1.06)

 Health care (24) a

       

 Transport (25) a

       
  1. aDeleted items for e