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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].