Sherrilene Classen, Pey-Shan Wen, Craig A. Velozo, Michel Bédard, Sandra M. Winter, Babette Brumback, Desiree N. Lanford; Psychometrics of the Self-Report Safe Driving Behavior Measure for Older Adults. Am J Occup Ther 2012;66(2):233-241. doi: 10.5014/ajot.2012.001834.
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© 2017 American Occupational Therapy Association
We investigated the psychometric properties of the 68-item Safe Driving Behavior Measure (SDBM) with 80 older drivers, 80 caregivers, and 2 evaluators from two sites. Using Rasch analysis, we examined unidimensionality and local dependence; rating scale; item- and person-level psychometrics; and item hierarchy of older drivers, caregivers, and driving evaluators who had completed the SDBM. The evidence suggested the SDBM is unidimensional, but pairs of items showed local dependency. Across the three rater groups, the data showed good person (≥3.4) and item (≥3.6) separation as well as good person (≥.93) and item reliability (≥.92). Cronbach’s α was ≥.96, and few items were misfitting. Some of the items did not follow the hypothesized order of item difficulty. The SDBM classified the older drivers into six ability levels, but to fully calibrate the instrument it must be refined in terms of its items (e.g., item exclusion) and then tested among participants of lesser ability.
Grahic Jump Location
The SDBM is a psychometrically sound self- or proxy report measure that is used to assess (un)safe driving behaviors among older adults from a comprehensive person–vehicle–environment approach.
The SDBM can be completed, using paper and pen, within 20 minutes to minimize respondent burden.
The items of the SDBM are built on a hierarchy to provide an entry point for occupational therapy assessment and, potentially, intervention.
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