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Table 4 Threshold disordering tests for each domain on WHOQOL-BREF

From: Psychometric evaluation, using Rasch analysis, of the WHOQOL-BREF in heroin-dependent people undergoing methadone maintenance treatment: further item validation

Domain

    

Threshold

Average measure

Step measure

Infit

Outfit

Physical

    

1

-1.43

-

1.10

1.17

2

-0.65

-2.96

1.12

1.27

3

-0.03

-0.86

0.87

0.86

4

1.21

0.21

0.87

0.89

5

2.53

3.62

1.04

0.98

Psychological

    

1

-2.42

-

1.19

1.25

2

-1.29

-2.80

1.01

1.04

3

-0.19

-1.29

0.86

0.83

4

1.32

0.59

0.93

0.92

5

2.87

3.49

1.13

1.07

Social

    

1

-3.57

--

1.28

1.33

2

-2.34

-4.31

0.96

1.11

3

-0.70

-2.30

0.69

0.59

4

2.35

0.54

0.97

0.95

5

4.75

6.07

1.41

1.06

Environment

    

1

-2.56

--

1.02

1.09

2

-1.35

-2.98

0.98

1.00

3

-0.25

-1.43

0.85

0.82

4

1.34

0.29

0.92

0.93

5

2.84

4.12

1.46

1.18

  1. Misfit values are in bold.
  2. 1 = Very poor/Very dissatisfied/Not at all/Never/None at all.
  3. 2 = Poor/Dissatisfied/A little/Slightly/Seldom/Slight/Sometimes.
  4. 3 = Neither poor nor good/Neither satisfied nor dissatisfied/A moderate amount/Moderately/Quite often/Moderate/Rather frequently.
  5. 4 = Good/Satisfied/Very much/Very/Mostly/Very often/Great/Very frequently.
  6. 5 = Very good/Very satisfied/An extreme amount/Extremely/Completely/Total/Always.