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Table 3 Responsiveness, reality, and ceiling and floor effects of SF-36 scales

From: Assessment of health-related quality of life using the SF-36 in Chinese cervical spondylotic myelopathy patients after surgery and its consistency with neurological function assessment: a cohort study

QOL measures: SF-36 scales Lowest possible score (floor) (%) Highest possible score (ceiling) (%) Cronbach α ES
Physical function 4 (3.03) 1 (0.76) 0.85 0.91
Role-physical 13 (9.85) 3 (2.27) 0.83 0.93
Bodily pain 2 (1.51) 3 (2.27) 0.80 0.57
General health 0 1 (0.76) 0.81 0.79
Vitality 2 (1.51) 1 (0.76) 0.81 0.73
Social function 1 (0.76) 2 (1.51) 0.79 0.74
Role-emotional 21 (15.9) 7 (5.30) 0.73 0.82
Mental health 1 (0.76) 4 (3.03) 0.75 0.77
  1. QOL: quality of life; ES: effect size.