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Table 6 Item-scale correlation matrix for the four WHOQOL-BREF measures* (n = 1164)

From: Psychometric properties of the Iranian interview-administered version of the World Health Organization's Quality of Life Questionnaire (WHOQOL-BREF): A population-based study

  Physical health Psychological health Social relationships Environmental health
Physical health (item number)     
Pain (3) 0.55 0.34 0.18 0.25
Dependence of medical aids (4) 0.52 0.29 0.18 0.25
Energy (10) 0.58 0.47 0.26 0.37
Mobility (15) 0.53 0.40 0.24 0.28
Sleep and rest (16) 0.34 0.30 0.23 0.26
Activities of daily living (17) 0.62 0.48 0.32 0.36
Work capacity (18) 0.48 0.46 0.30 0.32
Psychological health (item number)     
Positive feeling (5) 0.40 0.56 0.37 0.49
Personal belief (6) 0.31 0.52 0.33 0.41
Concentration (7) 0.33 0.44 0.28 0.34
Bodily image (11) 0.35 0.27 0.16 0.18
Self-esteem (19) 0.41 0.43 0.38 0.30
Negative feeling (26) 0.39 0.41 0.29 0.34
Social relationships (number of items)     
Personal relationship (20) 0.28 0.39 0.36 0.25
Sexual activity (21) 0.25 0.32 0.26 0.27
Social support (22) 0.17 0.27 0.24 0.35
Environmental health (item number)     
Security (8) 0.27 0.36 0.27 0.46
Physical environment (9) 0.12 0.25 0.23 0.44
Financial support (12) 0.32 0.45 0.29 0.48
Accessibility of information (13) 0.25 0.31 0.24 0.37
Leisure activity (14) 0.34 0.42 0.30 0.44
Home environment (23) 0.19 0.27 0.31 0.45
Health care (24) 0.28 0.26 0.25 0.48
Transport (25) 0.33 0.31 0.28 0.43
  1. * Pearson correlation (r) equal to or greater than 0.40 was considered satisfactory.