Table 3.
Spearman Correlation Coefficients of PROMIS PF-CAT Versus Traditional Instruments With Those Expected to Have Convergent and Divergent Validity According to Health Domains Assesseda
| Instrument | Spearman Correlation | P |
|---|---|---|
| Convergent validity | ||
| SF-36 PF | 0.78 | <.01 |
| KOOS ADL | 0.68 | <.01 |
| KOOS Sports/Recreation | 0.58 | <.01 |
| AKPS | 0.68 | <.01 |
| Divergent validity | ||
| Marx | 0.13 | .23 |
| SF-36 GH | 0.12 | .26 |
| KOOS Pain | 0.62 | <.01 |
| KOOS QOL | 0.53 | <.01 |
| KOOS Symptoms | 0.47 | <.01 |
| EQ-5D | 0.60 | <.01 |
aADL, Activities of Daily Living; AKPS, Anterior Knee Pain Scale; CAT, computer adaptive test; EQ-5D, EuroQol 5 dimensions; GH, general health; KOOS, Knee injury and Osteoarthritis Outcome Score; Marx, Marx Activity Rating Scale; PF, physical function; PROMIS, Patient-Reported Outcome Measurement Information System; QOL, Quality of Life; SF-36, 36-Item Short Form Health Survey.