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Table 5 Ability of the Instruments to discriminate between individuals on the basis of self-rated health

From: Parsimonious and efficient assessment of health-related quality of life in osteoarthritis research: validation of the Assessment of Quality of Life (AQoL) instrument

 

Self-rated General Health

Comparison of Means

 

ROC

Absolute Performance Gain

Instruments

Poor health (n = 54)

Good health (n = 168)

Effect size #

SD.

t

RE

Area Under Curve

Asymptotic 95% CI

Z

APG %

95% CI

 

M

SD.

M

SD.

     

Lower

Upper

  

Lower

Upper

AQOL

               

Utility Score

0.32

0.20

0.52

0.21

-1.00

0.20

-6.4

1.00

**0.76

0.69

0.83

Reference

   

Independent living

0.67

0.22

0.80

0.19

-0.69

0.20

-4.4

0.48

**0.68

0.60

0.77

1.05

15.8

1.1

30.4

Social relationships

0.76

0.21

0.85

0.17

-0.53

0.18

-3.4

0.29

**0.67

0.59

0.75

1.14

17.8

2.4

33.1

Physical senses

0.89

0.10

0.91

0.09

-0.23

0.09

-1.4

0.05

0.56

0.47

0.64

^2.06

40.6

21.3

59.9

Psychological wellbeing

0.66

0.17

0.80

0.13

-0.98

0.14

-6.3

0.97

**0.79

0.72

0.86

-0.38

5.7

-9.2

20.7

SF-36

               

Physical function

26.6

17.7

40.8

22.4

-0.66

21.4

-4.3

0.44

**0.69

0.62

0.77

0.79

14.0

-3.4

31.3

Role physical

5.6

15.1

31.1

38.8

-0.74

34.6

-4.7

0.55

**0.69

0.61

0.76

0.79

15.1

-3.7

34.0

Bodily pain

24.8

14.0

43.7

18.1

-1.10

17.2

-7.0

1.21

**0.80

0.73

0.87

-0.46

7.4

-8.4

23.3

Vitality

28.8

18.0

50.3

19.5

-1.12

19.2

-7.2

1.26

**0.78

0.72

0.85

-0.25

4.2

-12.5

21.0

Social function

51.9

21.5

69.8

27.1

-0.69

25.8

-4.4

0.48

**0.70

0.63

0.78

0.71

11.4

-4.4

27.2

Role emotional

24.7

39.0

64.0

42.7

-0.94

41.8

-6.0

0.89

**0.73

0.66

0.81

0.28

5.4

-13.2

23.9

Mental health

54.7

17.4

70.6

18.7

-0.86

18.4

-5.5

0.75

**0.74

0.67

0.81

0.25

4.3

-12.8

21.4

PCS

25.3

5.6

32.4

9.2

-0.84

8.5

-5.4

0.71

**0.74

0.67

0.81

0.26

4.9

-1.4

23.4

WOMAC

               

Pain

57.6

17.9

41.8

20.2

0.81

19.7

5.2

0.65

**0.73

0.65

0.80

0.41

7.2

-10.1

24.5

Stiffness

64.8

18.0

49.0

18.8

0.85

18.6

5.4

0.72

**0.72

0.65

0.80

0.41

7.6

-10.4

25.6

Physical function

59.6

15.5

43.1

19.7

0.88

18.8

5.6

0.77

**0.74

0.67

0.81

0.23

3.9

-12.5

20.4

WOMAC score

59.6

15.0

43.3

18.5

0.92

17.6

5.9

0.84

**0.75

0.68

0.82

0.13

2.1

-14.3

18.5

VAS (over past week)

               

Average pain

-62.3

21.0

-46.4

23.2

-0.70

22.7

-4.5

0.49

**0.69

0.61

0.77

0.75

13.6

-4.3

31.4

Pain at rest

-45.3

21.7

-28.0

21.8

-0.79

21.8

-5.1

0.63

**0.72

0.65

0.80

0.43

7.8

-10.0

25.7

ADL Restriction

-54.7

23.5

-39.6

25.5

-0.60

25.1

-3.8

0.36

**0.66

0.59

0.74

1.11

19.4

2.3

36.6

  1. N = 222, * All significant < 0.001 except Physical senses, p = 0.15.
  2. #Note: For the effect size calculations the poor health group was nominated as the 'control group'.
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Health and Quality of Life Outcomes

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