Item development and validity testing for a self- and proxy report: the safe driving behavior measure.
OBJECTIVE
We report on item development and validity testing of a self-report older adult safe driving behaviors measure (SDBM).


METHODS
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, we developed items capturing safe driving behavior. Item development was further informed by focus groups. We established face validity using peer reviewers and content validity using expert raters.


RESULTS
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.


CONCLUSIONS
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.
Classen
Sherrilene
S
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
Winter
Sandra M
SM
Velozo
Craig A
CA
Bédard
Michel
M
Lanford
Desiree N
DN
Brumback
Babette
B
Lutz
Barbara J
BJ
D001334:Automobile Driving; D055812:Community-Based Participatory Research; D006293:Health Promotion; D006801:Humans; D008962:Models, Theoretical; D011594:Psychometrics; D012449:Safety