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Performance-based versus patient-reported physical function: what are the underlying predictors?

Jonathan F Bean¹, Daniele D Olveczky, Dan K Kiely

¹Department of Physical Medicine and Rehabilitation, Harvard Medical School, and Spaulding Rehabilitation Hospital, 1575 Cambridge St, Cambridge, MA 02138, USA. jfbean@partners.org

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|October 18, 2011

Summary

This summary is machine-generated.

Performance-based and patient-reported measures assess different aspects of older adult function. The Short Physical Performance Battery (SPPB) relates to physical factors, while the Late-Life Function and Disability Instrument (LLFDI) also includes psychosocial influences.

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Area of Science:

Rehabilitation Science
Gerontology
Biomedical Engineering

Background:

Functional limitations are measured by physical performance and patient-reported function in rehabilitation science.
Differences between these two measurement modes are not well-defined.

Purpose of the Study:

Compare the Short Physical Performance Battery (SPPB) with the Late-Life Function and Disability Instrument (LLFDI) function component.
Examine associations with physiologic, psychosocial, and health factors influencing rehabilitative care.

Main Methods:

Cross-sectional analysis of community-dwelling older adults (N=137) with mobility limitations.
Used SPPB (performance-based) and LLFDI (patient-reported) as functional outcomes.
Assessed leg strength, leg velocity, exercise tolerance, age, sex, BMI, chronic conditions, depression, and falls efficacy.

Main Results:

SPPB and LLFDI explained 33% and 42% of outcome variance, respectively.
Leg velocity and exercise tolerance duration associated with both measures.
SPPB linked to leg strength and age; LLFDI linked to chronic conditions, sex, and falls efficacy.

Conclusions:

Performance-based and patient-reported measures capture distinct aspects of older adult functioning.
SPPB associated with physiologic factors and age; LLFDI associated with these plus psychosocial and health factors.
Findings may not generalize beyond older adults with mobility limitations.