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  • Title: Reliability of the clinical outcome variables scale when administered via telephone to assess mobility in people with spinal cord injury.
    Author: Barker RN, Amsters DI, Kendall MD, Pershouse KJ, Haines TP.
    Journal: Arch Phys Med Rehabil; 2007 May; 88(5):632-7. PubMed ID: 17466733.
    Abstract:
    OBJECTIVE: To examine the equivalence reliability and test-retest reliability of the Clinical Outcome Variables Scale (COVS) when administered via telephone (TCOVS) to people with spinal cord injury (SCI). DESIGN: Equivalence (telephone administration vs in-person) and test-retest reliability study. SETTING: Assessments conducted in participants' home environment. PARTICIPANTS: Equivalence reliability was examined in a convenience sample of 37 people with a diagnosis of traumatic SCI who had been discharged from the Queensland Spinal Injuries Unit to the community. In a separate group of participants, test-retest reliability of COVS when administered via telephone was examined in 43 people with SCI who were randomly selected from the Queensland Spinal Cord Injuries Service records. INTERVENTIONS: Not applicable. MAIN OUTCOME MEASURES: Reliability was assessed at the subscale and composite score level using intraclass correlation coefficients (ICC(2,1)) and Bland-Altman limits of agreement. RESULTS: Reliability was good for TCOVS and COVS for the composite score (ICC=.98), mobility subscale (ICC=.97), and ambulation subscale (ICC=.99). Reliability was also good for TCOVS test and retest assessments for the composite score (ICC=1), mobility subscale (ICC=1), and ambulation subscale (ICC=1). For all comparisons, most data points were within the 95% limits of agreement and the width of limits of agreement were considered to be clinically acceptable. CONCLUSIONS: The study findings confirm the equivalence and test-retest reliability of the TCOVS in an SCI population when administered by trained raters.
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