Villagomez AC, McKernan G, Houtrow AJ, Dicianno BE. Establishing Content Validity Evidence of the Pittsburgh Impairment Testing Tool (PITT) for Adults With Spina Bifida.
Top Spinal Cord Inj Rehabil 2022;
28:63-72. [PMID:
36017127 DOI:
10.46292/sci22-00001]
[Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
Background
Current scales to measure motor impairment in adults with spina bifida (SB) are limited by their complexity, variable interpretation (i.e., subjectively defined impairment levels), or inclusion of muscles groups that are not always practical to test in a clinical setting.
Objectives
A novel motor impairment tool for adults with SB was evaluated for content validity. The tool uses findings from the manual muscle testing of hip flexion and knee extension to categorize individuals into four motor impairment groups.
Methods
Expert feedback was obtained on the tool, and content validity was measured using Lawshe's content validity ratio (CVR) with critical values recommended by Ayre and Scally. Data from phase 1 and phase 2 were used to revise the survey and calculate the CVR of the tool, respectively (benchmark: CVR ≥ 0.636).
Results
Of the 26 experts recruited, 17 received the survey and 15 participated in either phase 1 (n = 6) or 2 (n = 11). The CVR values for each impairment group were as follows: intact strength (0.95), thoracic strength (0.90), hip flexor dominant strength (0.89), and knee extensor dominant strength (0.82). The CVR of the tool overall was 0.89. Qualitative expert feedback revealed common barriers to manual muscle testing and suggestions for improving the tool. However, experts also noted the value in preserving the simplicity of the tool.
Conclusion
The high content validity, coupled with expert feedback, suggests the tool may give clinicians and researchers a practical method of classifying an individual's extent of motor impairment.
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