Quality of life
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Satisfaction With Life Scale
Responses are seven discrete options, ranging from 1 (Strongly Disagree) to 7 (Strongly Agree). The overall score is an average of responses, with higher numbers indicating better life satisfaction. No items are reverse-coded.
WHOQOL-BREF
All items use 5-point scales.
Scoring procedure: Two items are analyzed individually: overall perception of quality of life, and overall perception of health. The remaining questions are clustered into four domains: Physical health, psychological health, social relationships, and environment. Three items are reverse-coded. Responses within each domain are averaged to create mean domain scores, which are then multiplied by 4 to make domain scores comparable with scores from the WHOQOL-100. Higher scores indicate a better outcome.
The WHOQOL-BREF scoring procedure allows up to 1 or 2 missing responses in a domain per participant, depending on the domain. For missing responses, the average domain score is used as a substitute. The domain score for that participant is invalid if there are too many missing responses. If the participants is missing >20% of their data overall, their overall WHOQOL-BREF score is invalid.
