The relationship between self-report and performance-based measures of physical function following an ICU stay

Michael J. Berry, Nathan J. Love, D. Clark Files, Rita N. Bakhru, Peter E. Morris

Research output: Contribution to journalArticlepeer-review

10 Scopus citations

Abstract

Purpose: To examine relationships between self-report and performance-based measures of physical function in ICU patients randomized to standardized rehabilitation therapy (SRT) or usual care (UC). Methods: Physical function was assessed in 257 ICU patients using self-report (physical functioning scale of the SF-36 (SF-36 PFS)) and the functional performance inventory-short form (FPI-SF) as well as performance-based measures (Short Physical Performance Battery (SPPB)) and muscular strength (MS). Assessments were at hospital discharge, 2, 4, and 6 months. Results: Correlations between self-report and performance-based measures were not significantly different between the two groups. When examining the entire cohort, a significant, but weak, correlation (r = 0.286) was found between the SF-36 PFS and the SPPB. At 2 months, moderate correlations were found between self-report and performance-based measures. The SF-36 PFS and FPI were significantly correlated with the SPPB (r = 0.536 and 0.553, respectively) and muscular strength (r = 0.413 and 0.431, respectively). Similar associations were seen at 4 and 6 months in both groups. Conclusion: Self-report and performance-based measures of physical function appear to assess different constructs at hospital discharge. Following recovery, these measures converge, but indicate different constructs are being assessed. As such, both self-report and performance-based measures of physical function should be used with ICU patients.

Original languageEnglish
Pages (from-to)19-23
Number of pages5
JournalJournal of Critical Care
Volume51
DOIs
StatePublished - Jun 2019

Bibliographical note

Publisher Copyright:
© 2019

Keywords

  • Acute respiratory failure
  • Critical care
  • Critical illness
  • Intensive care unit
  • Physical function
  • Strength

ASJC Scopus subject areas

  • Critical Care and Intensive Care Medicine

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