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The relationship between self-reports and objective measures of disability in patients with late sequelae of
V K Noonan1, E Dean, M Dallimore
1Department of Orthopaedics at Vancouver Hospital, BC, Canada.
Objective:
To establish the validity of 2 objective measures of disability based on 2 self-reports in individuals with the late sequelae of poliomyelitis (LSP).
Design:
Nonexperimental research design.
Setting:
Regional ambulatory clinic specializing in the management of patients with LSP.
Participants:
Seventeen community dwellers with LSP.
Intervention:
Completion of 2 exercise tests: the 6-minute walk (6-MW) test and a steady-rate walking test to calculate the cardiorespiratory conditioning index (CRCI), and 2 health status questionnaires: the Sickness Impact Profile (SIP) and Medical Outcomes Study Short-Form 36 (SF-36).
Main Outcome Measures:
6-MW distance and the CRCI, and scores from the physical dimensions of the SIP and the SF-36.
Results:
The 6-MW distance correlated significantly with the physical dimension scores of both the SIP (r = -.57, p < .05) and the SF-36 (r = .67, p < .05). Significant correlations were also observed between the CRCI and the physical dimension scores of the SIP (r = -.51, p < .05) and the SF-36 (r = .70, p < .01). The 2 objective measures correlated significantly with each other (r = .51, p < .05) as did the 2 physical dimension scores of the SIP and the SF-36 (r = -.80, p < .01).
Conclusions:
Although objective measures of disability corroborated self-reports of patients with LSP and, thus, supported their validity, each measure has a distinct role in clinical decision making.