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Table 2 Performance of the four domains of 19-item modified WHOQOL scale using Rasch model adjustment (sample size, n = 300)

From: Psychometric evaluation of the modified 19-item Bengali version of WHOQOL scale using Rasch analysis: a cross-sectional study of a rural district in Bangladesh

 

Data on Validation Process

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

Location

SE

Residual

χ2

P value

  

Overall

       

 Overall QoL (1)

0.29

0.10

0.45

2.48

0.63

  

 General Health (2)

−.029

0.09

0.59

2.99

0.25

  

Physical domain

     

Unidimensionality test

3.7% CI (1.2–6.1)

 Pain (3)

−0.30

0.11

−1.82

8.42

0.07

Person separation index

0.873

 Dependence of medical aids (4)

0.24

0.11

1.73

5.83

0.21

Cronbach’s Alpha

0.881

 Energy (10)

1.02

0.10

−0.65

3.37

0.49

Chi-square (Degrees of freedom)

32.13 (20)

 Mobility (15)

−1.04

0.10

−0.38

5.88

0.20

Probability value

0.0418*

 Activities of daily living (17)

0.08

0.11

−0.76

8.63

0.07

Items fit residual, mean (SD)

−0.17 (1.38)

      

Persons fit residual, mean (SD)

−0.42 (1.05)

Psychological domain

     

Unidimensionality test

4.3% CI (1.9–6.8)

 Positive feeling (5)

0.18

0.10

0.48

2.52

0.64

Person separation index

0.739

 Concentration (7)

0.14

0.09

−0.32

2.04

0.73

Cronbach’s Alpha

0.746

 Bodily image (11)

0.40

0.10

0.57

3.23

0.52

Chi-square (Degrees of freedom)

14.93 (16)

 Self-esteem (19)

−0.72

0.10

−0.39

7.15

0.13

Probability value

0.529

      

Items fit residual, mean (SD)

0.08 (0.51)

      

Persons fit residual, mean (SD)

−0.42 (1.01)

Social domain

     

Unidimensionality test

3.3% CI (0.9–5.8)

 Personal relationship (20)

−0.08

0.13

−0.42

9.51

0.05

Person separation index

0.650

 Sexual activity (21)

0.63

0.10

0.22

2.12

0.73

Cronbach’s Alpha

0.670

 Social support (22)

0.01

0.11

0.49

0.98

0.91

Chi-square (Degrees of freedom)

12.62 (12)

      

Probability value

0.397

      

Items fit residual, mean (SD)

0.10 (0.46)

      

Persons fit residual, mean (SD)

−0.44 (0.92)

Environmental domain

     

Unidimensionality test

5.0% CI (2.5–7.5)

 Security (8)

0.96

0.08

−0.50

1.12

0.89

Person separation index

0.753

 Physical environment (9)

−0.70

0.09

−0.43

2.98

0.56

Cronbach’s Alpha

0.781

 Financial support (12)

−2.31

0.09

0.93

5.70

0.22

Chi-square (Degrees of freedom)

22.01 (20)

 Accessibility of information (13)

0.37

0.10

−0.78

5.17

0.27

Probability value

0.339

 Leisure activity (14)

1.68

0.10

0.78

7.03

0.13

Items fit residual, mean (SD)

−0.01 (0.79)

      

Persons fit residual, mean (SD)

−0.32 (0.96)

  1. Person separation index and Cronbach’s Alpha assess the reliability of the scale: χ2 Chi-square value CI: Confidence interval, SE: Standard Error, SD: Standard deviation
  2. Probability of Chi-square value should be higher than .05, Because the number of items of the physical domain is five, so with Bonferroni corrected p-values for the domain is (.05/5 = 0.01). Any p- value > 0.01 will be considered non-significant at 0.05 level for physical domain.
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BMC Psychology

ISSN: 2050-7283

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