Correlation and Crosswalks Between Patient-Reported Functional Outcomes and PROMIS Physical Function Among Medically Ill Patients.
Elizabeth Marfeo, Pengsheng Ni, Chun Wang and 2 others
PMID 34963574WHAT IT FOUND
FAMCAT Daily Activity scores can be converted to PROMIS Physical Function scores for group comparisons.
Basic Mobility and Applied Cognition scales did not meet criteria for linking. Clinicians cannot directly swap individual patient scores between these specific FAMCAT domains and PROMIS.
Key findings
01The FAMCAT Daily Activity scale successfully linked to the PROMIS Physical Function short form, creating a crosswalk for group-level comparisons.
02The FAMCAT Basic Mobility scale failed population invariance checks for age, preventing the creation of a valid crosswalk to PROMIS Physical Function.
03The FAMCAT Applied Cognition scale did not correlate sufficiently with PROMIS Physical Function to allow linking, as it measures a different construct.
STILL TO COME
How it was doneWhat they foundWhat it means for PTsWhat it means for OTs
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What it does not show
The study used the same sample to both develop and validate the linking, which may overestimate the accuracy of the crosswalk. The correlation for Daily Activity (0.78) was sufficient for group comparisons but not for individual-level score swaps. The sample consisted of medically ill patients who were mostly discharged to home, so the results may not apply to patients with more severe functional limitations or different discharge outcomes. Fatigue effects in hospitalized patients were not controlled for, which might have influenced responses to the sequential assessments.
Declared interests
The study was supported by the NIH. No other conflicts of interest were reported.
The easy way to misread this
Do not use the crosswalk to convert an individual patient's FAMCAT score to a PROMIS score for clinical decision-making. The linkages are validated only for group-level comparisons, and the Basic Mobility and Applied Cognition domains failed the statistical criteria for linking entirely.