Table 4.
Floor and Ceiling Effects of PROMIS PF-CAT and Legacy PROMsa
| Instrument | Number of Items | Ceiling | Floor |
|---|---|---|---|
| PROMIS PF-CAT | 4.3 ± 1.1 | 0 | 0 |
| SF-36 PF | 10 | 3 (3.3%) | 1 (1.1%) |
| KOOS ADL | 17 | 8 (8.8%) | 0 |
| KOOS Sports/Recreation | 5 | 4 (4.4%) | 8 (8.8%) |
aADL, Activities of Daily Living; CAT, computer adaptive test; KOOS, Knee injury and Osteoarthritis Outcome Score; PF, physical function; PROM, patient-reported outcome measure; PROMIS, Patient-Reported Outcome Measurement Information System; SF-36, 36-Item Short Form Health Survey.