title: Psychometrics of the self-report safe driving behavior measure for older adults.
abstract: 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.
authors.affiliation: Department of Occupational Therapy, College of Public Health and Health Professions, University of Florida, PO Box 100164, Gainesville, FL 32611-0164, USA. sclassen@phhp.ufl.edu
authors.forename: Sherrilene
authors.initials: S
authors.lastname: Classen
authors.forename: Pey-Shan
authors.initials: PS
authors.lastname: Wen
authors.forename: Craig A
authors.initials: CA
authors.lastname: Velozo
authors.forename: Michel
authors.initials: M
authors.lastname: Bédard
authors.forename: Sandra M
authors.initials: SM
authors.lastname: Winter
authors.forename: Babette
authors.initials: B
authors.lastname: Brumback
authors.forename: Desiree N
authors.initials: DN
authors.lastname: Lanford
mesh_terms: D000368:Aged; D000369:Aged, 80 and over; D001334:Automobile Driving; D006801:Humans; D011594:Psychometrics; D012449:Safety; D057566:Self Report