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Personalizing Functional Assessment in Chronic Obstructive Pulmonary Disease: A Validation Study of the
Asma Alonazi1, Monira I Aldhahi2, Rakan Nazer3
1Department of Physical Therapy and Health Rehabilitation, College of Applied Medical Sciences, Majmaah University, Al-Majmaah 11952, Saudi Arabia.
Journal of Clinical Medicine
|January 10, 2026
Summary
The Patient-Specific Functional Scale (PSFS) shows excellent reliability and validity for assessing functional performance in chronic obstructive pulmonary disease (COPD). This patient-centered tool aids personalized assessment in COPD patients.
Area of Science:
- Pulmonary Medicine
- Rehabilitation Science
- Psychometrics
Background:
- Chronic obstructive pulmonary disease (COPD) management requires patient-centered tools for assessing functional performance.
- The Patient-Specific Functional Scale (PSFS) is a potential tool, but its psychometric properties in COPD are not well-established.
Purpose of the Study:
- To evaluate the test-retest reliability and construct validity of the PSFS in individuals with COPD.
- To determine the measurement error (SEM, MDC95%) of the PSFS in this population.
Main Methods:
- Longitudinal psychometric evaluation of 70 adults with confirmed COPD.
- PSFS administered twice (4-7 days apart) for reliability assessment.
- Correlations with Duke Activity Status Index (DASI) and St. George's Respiratory Questionnaire (SGRQ) for construct validity.
Main Results:
- PSFS demonstrated excellent test-retest reliability (ICC=0.94) and low measurement error (SEM=0.16, MDC95%=0.44).
- Moderate correlations supported construct validity (DASI: r=0.51; SGRQ: r=-0.41).
- No floor or ceiling effects were observed.
Conclusions:
- The PSFS exhibits strong psychometric properties for assessing functional limitations in COPD patients.
- Its individualized nature and ease of use support its clinical and research utility for personalized functional assessment.
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