The authors report on item development and validity testing of a self-report older adult safe driving behaviors measure (SDBM). On the basis of theoretical frameworks (Precede-Proceed Model of Health Promotion, Haddon's matrix, and Michon's model), existing driving measures, and previous research and guided by measurement theory, the authors developed items capturing safe driving behavior. Item development was further informed by focus groups. They established face validity using peer reviewers and content validity using expert raters. Peer review indicated acceptable face validity. Initial expert rater review yielded a scale content validity index (CVI) rating of 0.78, with 44 of 60 items rated > or = 0.75. Sixteen unacceptable items (< or = 0.5) required major revision or deletion. The next CVI scale average was 0.84, indicating acceptable content validity. The SDBM has relevance as a self-report to rate older drivers. Future pilot testing of the SDBM comparing results with on-road testing will define criterion validity. (Author/publisher)
Samenvatting