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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