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Table 2 Internal consistency (Cronbach's alpha), Eigen values and percent of variance for the factors

From: Confirmatory factor analytical study of the WHOQOL-Bref: experience with Sudanese general population and psychiatric samples

Factor labels No of items Cronbach's alpha Eigen value % of variance
A: factors from 623 general population data     
F1: Life satisfaction 10 0.85 7.11 27.33
F2: Sense of enjoyment 5 0.73 2.01 7.71
F3: Environmental health 5 0.68 1.45 5.58
F4: Social relations 3 0.45 1.38 5.29
F5: Physical and mental health** 3 0.52 1.18,1.06 4.54, 4.08
Total: for all items together 26 0.88   54.54
B: WHO 4-domain model on general population     
F1: Physical health 7 0.71   
F2: Psychological health 6 0.71   
F3: Social relations 3 0.45   
F4: Environment 8 0.74   
C: WHO 6-domain model on general population     
F1: Physical health 3 0.40   
F2: Psychological 5 0.61   
F3: Independence 4 0.58   
  1. • *Items for WHO 6-domain environment and social relations are identical with 4-domain factors; F6 is "life meaningful"
  2. • ** For factors from general population: original F5 (2 items, alpha value = 0.685, Eigen value, 1.18; % variance = 4.08), merged with F6 (Eigen value, 1.06; % variance = 4.08). **** Cronbach's coefficient's value is associated with the number of items in a scale.