2.9. Quality of Life
pain
Measured by the Medical Outcomes Study 36-Item Short Form—SF-36. This instrument is a validated questionnaire method with high sensitivity to detect functional status, among other aspects of quality of life. It includes eight multiple-item subscales of functional capacity, physical limitation, pain, general health, vitality, social aspects, emotional limitations and mental health. The total score on each SF-36 subscale ranges between 0 and 100, and higher the score is, the better the patient is [