Using a Measurement Type-independent Metric to Compare Patterns of Determinants Between Patient-reported Versus Performance-based Physical Function in Hemodialysis Patients

Overview

Journal Qual Life Res

Specialties Pharmacology
Rehabilitation Medicine

Date 2024 Aug 5

PMID 39103575

Authors

Gregor Liegl

Felix H Fischer

Bernard Canaud

Mark Woodward

Claudia Barth

Andrew Davenport

Marietta Torok

Giovanni F M Strippoli

Jorgen Hegbrant

Krister Cromm

Michiel L Bots

Peter J Blankestijn

Kathrin I Fischer

Matthias Rose

Affiliations

Soon will be listed here.

Abstract

Purpose: We applied a previously established common T-score metric for patient-reported and performance-based physical function (PF), offering the unique opportunity to directly compare measurement type-specific patterns of associations with potential laboratory-based, psychosocial, sociodemographic, and health-related determinants in hemodialysis patients.

Methods: We analyzed baseline data from the CONVINCE trial (N = 1,360), a multinational randomized controlled trial comparing high-flux hemodialysis with high-dose hemodiafiltration. To explore the associations of potential determinants with performance-based versus patient-reported PF, we conducted multiple linear regression (backward elimination with cross-validation and Lasso regression). We used standardized T-scores as estimated from the PROMIS PF short-form 4a (patient-reported PF) and the Physical Performance Test (performance-based PF) as dependent variables.

Results: Performance-based and patient-reported PF were both significantly associated with a laboratory marker-based indicator of muscle mass (simplified creatinine index), although the effects were relatively small (partial f = 0.04). Age was negatively associated with PF; the effect size was larger for performance-based (partial f = 0.12) than for patient-reported PF (partial f = 0.08). Compared to performance-based PF, patient-reported PF showed a stronger association with self-reported health domains, particularly pain interference and fatigue. When using the individual difference between patient-reported and performance-based T-scores as outcome, we found that younger age and more fatigue were associated with lower patient-reported PF compared to performance-based PF (small effect size).

Conclusion: Patient-reported and performance-based assessments were similarly associated with an objective marker of physical impairment in hemodialysis patients. Age and fatigue may result in discrepancies when comparing performance-based and patient-reported scores on the common PF scale. Trial Registration CONVINCE is registered in the Dutch Trial Register (Register ID: NL64750.041.18). The registration can be accessed at: https://onderzoekmetmensen.nl/en/trial/52958 .

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