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Table 2 Descriptive statistics of outcome measures in patients with knee osteoarthritis including floor and ceiling effects

From: Patient-Reported Outcomes Measurement Information System (PROMIS) instruments among individuals with symptomatic knee osteoarthritis: a cross-sectional study of floor/ceiling effects and construct validity

Outcome Measure Scores Floor Ceiling
Score Range n Mean ± SD Median (range) n % n %
PROMIS Pain Interference 41-78.3 204 58.0 (7.0) 58.1 (41.0-74.4) 11 5.4 0 0
PROMIS Physical Functiona 14.1-61.7 204 40.7 (5.5) 40.2 (28.8-61.7) 0 0 1 0.5
PROMIS Anxiety 36.3-82.7 203 50.2 (8.9) 51.3 (36.3-72.9) 34 16.8 0 0
PROMIS Depression 37.1-81.1 202 48.9 (8.9) 48.2 (37.1-77.9) 49 24.3 0 0
SF-36 PCSa 0-100 204 36.6 (9.1) 36.7 (14.0-59.8) 0 0 0 0
SF-36 MCSa 0-100 204 52.5 (9.2) 54.5 (21.6-68.1) 0 0 0 0
SF-36 Bodily Paina 0-100 204 47.5 (18.6) 41.0 (0.0-100.0) 1 0.5 4 2.0
SF-36 Physical Function 0-100 204 52.0 (22.2) 50.0 (0.0-100.0) 2 1.0 3 1.5
WOMAC Pain 0-500 203 254 (98.6) 239.8 (50.7-500.0) n/a n/a 1 0.5
WOMAC Function 0-1700 204 899.0 (352.4) 906.7 (218.6, 1700.0) 0 0 1 0.5
6-min Walk Testab (meters) n/a 199 395.5 (90.1) 392.8 (89.1-645.3) n/a n/a n/a n/a
20-Meter Walk Testa (seconds) n/a 202 19.0 (5.3) 18.2 (9.6-66.8) n/a n/a n/a n/a
PSS 0-40 203 13.3 (7.0) 13.0 (0.0, 37.0) 5 2.5 0 0
BDI-II 0-63 199 7.6 (8.6) 5.0 (0.0-39.0) 27 13.6 0 0
  1. PROMIS = Patient Reported Outcomes Measurement Information System (reported as T-scores); SF-36 = Medical Outcomes Short Form-36, MCS = Mental Component Summary, PCS = Physical Component Summary, BP = Bodily Pain; WOMAC = Western Ontario and McMaster Universities Arthritic Index; PSS = Perceived Stress Scale; BDI-II = Beck Depression Index II
  2. aHigher scores indicate better health-related outcomes (for other measures, higher scores indicates worse health-related outcomes)
  3. bDoes not include patients who refused, or attempted and failed