Performance of the Physical Functioning Activities of Daily Living Scale in the 2020 Medicare Health Outcomes Survey.
Ron D Hays, Marc N Elliott
PMID 37995776WHAT IT FOUND
The 8-item PFADL scale reliably measures physical function in Medicare patients.
It is best for identifying limitations, as 26% of respondents scored at the maximum, leaving little room to detect differences among those with higher function. Use it to screen for disability, not to grade top performers.
Key findings
01The scale demonstrates strong internal consistency (alpha and omega of 0.86) and unidimensionality, confirming it measures a single construct of physical function.
02Scores are validly associated with clinical markers: worse physical function correlates with more comorbidities, disability days, balance problems, and falls.
03The scale has a ceiling effect where 26% of respondents achieved the highest possible score, indicating it is less precise for distinguishing among patients with high physical function.
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 relied on self-reported data, which may be subject to recall bias. The response rate was 37%, so the findings may not fully represent the broader Medicare population. The scale showed a ceiling effect, limiting its ability to measure changes in patients with high physical function. Mode effects were possible, as the survey was administered by mail and phone.
Declared interests
The authors report no conflict of interest. The study used public use files constructed in accordance with CMS and Department of Health and Human Services policies.
The easy way to misread this
Do not use the PFADL to assess progress in patients who are already highly functional. Because 26% of respondents scored at the ceiling, the scale cannot reliably detect improvements in this group. It is best suited for identifying and monitoring limitations.