The World Health Organization Quality of Life (WHOQOL)-BREF comprises 26 items assessing the QOL in four domains: physical health (7 items); psychological health (6 items); social relationships (3 items); and environmental health (8 items). Each item was rated on a five-point Likert-scale, ranging from “1” (not at all/very dissatisfied) to “5” (completely/extremely/very satisfied). These ratings were then linearly converted to a scale of 0 to 100 for analysis and interpretation (2, 19, 20).
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