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Table 3 Performance of the Rasch analysis of the WHOQOL-BREF domains (sample size, n = 2425)

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 scales

Original instrument

Summary of overall model fit statistics of each domain (original instrument)

Location

S. E.

Residual

χ2

p-value

Overall

 Overall QOL (1)

0.07

0.04

−2.08

74.36

0.000

  

 General Health (2)

−0.07

0.04

−3.29

58.37

0.000

  

Physical domain

 Pain (3)

−1.36

0.03

−1.57

101.14

0.000

Person separation index

0.825

 Dependence on medical aids (4)

−1.35

0.04

3.95

96.71

0.000

Coefficient alpha

0.848

 Energy (10)

1.12

0.03

7.49

137.15

0.000

Chi-square (Degrees of freedom)

765.18 (28)

 Mobility (15)

0.22

0.03

−4.24

89.73

0.000

p-value

0.0000

 Sleep and rest (16)

−0.39

0.03

2.93

111.44

0.000

Items fit residual (mean (SD))

−1.09 (6.12)

 Activities of daily living (17)

0.97

0.04

−8.74

134.11

0.000

Persons fit residual (mean(SD)

−0.5 (1.19)

 Work capacity (18)

0.79

0.04

−7.49

94.89

0.000

  

Psychological domain

 Positive feeling (5)

0.15

0.03

−7.31

165.86

0.000

Person separation index

0.751

 Personal belief (6)

0.64

0.03

−5.11

207.74

0.000

Coefficient alpha

0.763

 Concentration (7)

−0.37

0.03

−7.31

117.79

0.000

Chi-square (Degrees of freedom)

843.59 (24)

 Bodily image (11)

−0.33

0.03

3.19

94.61

0.000

p- value

0.0000

 Self-esteem (19)

−0.89

0.03

5.83

183.12

0.000

Items fit residual (mean (SD))

−0.88 (6.36)

 Negative feeling (26)

0.80

0.03

5.45

74.47

0.000

Persons fit residual (mean (SD))

−0.32 (1)

Social domain

 Personal relationship (20)

−0.41

0.03

−4.51

126.29

0.000

Person separation index

0.549

 Sexual activity (21)

−0.14

0.03

−1.08

41.28

0.000

Coefficient alpha

a

 Social support (22)

0.55

0.03

0.65

75.64

0.000

Chi-square (Degrees of freedom)

243.2 (12)

      

p- value

0.0000

      

Items fit residual (mean (SD))

−1.65 (2.63)

      

Persons fit residual (mean (SD))

−0.37 (0.7)

Environmental domain

 Security (8)

−0.35

0.03

−2.46

53.73

0.000

Person separation index

0.716

 Physical environment (9)

0.30

0.03

−0.7

28.62

0.000

Coefficient alpha

0.711

 Financial support (12)

0.65

0.03

−10.14

211.65

0.000

Chi-square (Degrees of freedom)

859.57 (32)

 Accessibility of information (13)

−0.06

0.03

−6.72

125.97

0.000

p-value

0.0000

 Leisure activity (14)

−0.16

0.02

−0.71

17.56

0.001

Items fit residual (mean (SD))

−0.35 (6.25)

 Home environment (23)

− 0.49

0.03

4.26

79.78

0.000

Persons fit residual (mean (SD))

−0.26 (1.05)

 Health care (24)

0.15

0.03

4.66

70.61

0.000

  

 Transport (25)

−0.04

0.03

8.94

271.66

0.000

  
  1. aCoefficient of Alpha cannot be calculated on missing data