Improving the validity and reliability of a health promotion survey for physical therapists

Jaca L Stephens, John D Lowman, Cecilia L Graham, David M Morris, Connie L Kohler, Jonathan B Waugh
Cardiopulmonary Physical Therapy Journal 2013, 24 (1): 14-23

PURPOSE: Physical therapists (PTs) have a unique opportunity to intervene in the area of health promotion. However, no instrument has been validated to measure PTs' views on health promotion in physical therapy practice. The purpose of this study was to evaluate the content validity and test-retest reliability of a health promotion survey designed for PTs.

METHODS: An expert panel of PTs assessed the content validity of "The Role of Health Promotion in Physical Therapy Survey" and provided suggestions for revision. Item content validity was assessed using the content validity ratio (CVR) as well as the modified kappa statistic. Therapists then participated in the test-retest reliability assessment of the revised health promotion survey, which was assessed using a weighted kappa statistic.

RESULTS: Based on feedback from the expert panelists, significant revisions were made to the original survey. The expert panel reached at least a majority consensus agreement for all items in the revised survey and the survey-CVR improved from 0.44 to 0.66. Only one item on the revised survey had substantial test-retest agreement, with 55% of the items having moderate agreement and 43% poor agreement.

CONCLUSIONS: All items on the revised health promotion survey demonstrated at least fair validity, but few items had reasonable test-retest reliability. Further modifications should be made to strengthen the validity and improve the reliability of this survey.

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