Skip to main content

Table 2 Spearman's correlation coefficients between scales

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

 

Independent living

Social relationships

Physical senses

Psychological wellbeing

AQOL Utility

AQoL

     

   Independent living

     

   Social relationships

0.48

    

   Physical senses

0.10

0.20

   

   Psychological wellbeing

0.46

0.47

0.17

  

   AQOL Utility

0.78

0.75

0.38

0.77

 

SF-36

     

   Physical Function

0.59

0.34

0.17

0.43

0.59

   Role Physical

0.38

0.32

0.05

0.31

0.39

   Bodily Pain

0.54

0.43

0.07

0.60

0.63

   General Health

0.31

0.31

0.14

0.48

0.45

   Vitality

0.46

0.45

0.17

0.57

0.58

   Social Function

0.54

0.55

0.21

0.56

0.65

   Role Emotional

0.37

0.44

0.10

0.50

0.51

   Mental Health

0.37

0.51

0.21

0.55

0.57

   PCS

0.47

0.19

0.06

0.31

0.41

   MCS

0.39

0.55

0.20

0.61

0.60

WOMAC

     

   Pain

-0.49

-0.35

-0.03

-0.58

-0.56

   Stiffness

-0.43

-0.27

-0.06

-0.51

-0.51

   Physical Function

-0.59

-0.37

-0.10

-0.56

-0.63

   Total score

-0.59

-0.37

-0.09

-0.59

-0.63

VAS

     

   Average pain over past week

-0.50

-0.27

-0.07

-0.60

-0.56

   Pain while resting over past week

-0.39

-0.25

-0.09

-0.54

-0.49

   Restriction in ADL over past week

-0.59

-0.35

-0.10

-0.53

-0.59

   Lequesne score (hip only)

-0.71

-0.52

-0.26

-0.66

-0.76

  1. Note: Sample size for correlation between scales is n = 222 except for the Lequesne Index as it only relates to OA hip cases (n = 115).
  2. Using Cohen's convention, the magnitude of the correlations can be viewed as; > 0.5 large, 0.5 to 0.3 moderate and < 0.3 weak [18].