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Table 3 Results of the multi-trait statistics of QUALEFO-41 domains and EQ-5D

From: Validation of the osteoporosis quality of life questionnaire QUALEFFO-41 for the Serbian population

Questionnaire/domain Cronbach's α (range of Cronbach's α if item deleted) Range of item correlation coefficient with own domain (%)a Range of item correlation coefficient with other domains (%)a Intraclass correlation coefficient (n = 38)
Controls Cases Controls Cases Controls Cases Controls Cases
QUALEFFO-41         
Pain 0.82 (0.73-0.87) 0.86 (0.81-0.86) 0.21-0.92 (80.00) 0.69-0.88 (100.00) -0.21-0.47 (20.00) 0.15-0.55 (60.00) 0.78 (0.53-0.90) 0.87 (0.76-0.87)
Physical function 0.92 (0.91-0.93) 0.93 (0.92-0.94) 0.33-0.84 (94.12) 0.32-0.86 (94.11) 0.03-0.69 (45.59) 0.01-0.66 (76.47) 0.83 (0.62 - 0.92) 0.94 (0.88-0.97)
Social function 0.33 (0.08-0.51) 0.80 (0.75-0.80) 0.03-0.71 (57.14) 0.46-0.81 (100.00) -0.29-0.60 (17.86) -0.10-0.74 (50.00) 0.78 (0.52 - 0.90) 0.91 (0.82-0.95)
General health perception 0.48 (0.12-0.72) 0.81 (0.62-0.89) 0.45-0.83 (100.00) 0.77-0.91 (100.00) -0.01-0.45 (25.00) 0.38-0.73 (91.67) 0.15 (-0.59 - 0.55) 0.91 (0.84-0.95)
Mental function 0.74 (0.66-0.75) 0.79 (0.74-0.79) 0.39-0.79 (55.56) 0.37-0.81 (66.67) -0.01-0.62 (27.78) 0.01-0.65 (30.56) 0.76 (0.47 - 0.89) 0.89 (0.80-0.94)
Total QUALEFFO-41 score 0.91 (0.90-0.92) 0.83 (0.75-0.89)      0.82 (0.60 - 0.92) 0.96 (0.92 - 0.98)
EQ-5D         
Health state value 0.75 (0.73-0.88) 0.84 (0.83-0.89) -0.77- -0.56 (100.00) -0.82- -0.66 (100.00)     
  1. aA percent of correlation coefficients higher than 0.4
  2. QUALEFFO-41, Quality of Life Questionnaire of the European Foundation for Osteoporosis
  3. EQ-5D, EuroQol Group Questionnaire