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Table 4 Reliability and validity coefficients for WHOQOL-AGE, EUROHIS-QOL and WHOQOL-OLD short form version 1, in the 18–49 and 50+ age groups

From: Validation of an instrument to evaluate quality of life in the aging population: WHOQOL-AGE

  WHOQOL-AGE EUROHIS-QOL WHOQOL-OLD
18-49 years    
 Cronbach’s alpha 0.89 0.85 0.72
 Mean inter-item correlation 0.39 0.41 0.34
 Convergent validity (CV) 0.73 (0.70, 0.76) 0.74 (0.71, 0.77) 0.63 (0.58, 0.67)
 Discriminant validity (DV) 0.35 (0.29, 0.41) 0.34 (0.28, 0.40) 0.36 (0.29, 0.42)
 95% CI CV-DV (0.29, 0.47) (0.31, 0.49) (0.19, 0.36)
50+ years    
 Cronbach’s alpha 0.92 0.87 0.80
 Mean inter-item correlation 0.46 0.46 0.44
 Convergent validity (CV) 0.75 (0.73, 0.77) 0.76 (0.74, 0.79) 0.69 (0.67, 0.71)
 Discriminant validity (DV) 0.37 (0.33, 0.40) 0.36 (0.33, 0.40) 0.35 (0.31, 0.39)
 95% CI CV-DV (0.34, 0.42) (0.37, 0.45) (0.29, 0.37)
  1. CV = Pearson’s correlation coefficient (95% CI) with the Satisfaction With Life (SWL) item; DV = Pearson’s correlation coefficient (95% CI) with the net affect score; 95% CI CV-DV = 95% confidence interval for the difference between the convergent and the discriminant validity coefficients.