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

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

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

• *Items for WHO 6-domain environment and social relations are identical with 4-domain factors; F6 is "life meaningful"
• ** 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.

ISSN: 1471-2288