title: Validity and critical driving errors of on-road assessment for older drivers.
abstract: OBJECTIVE
  We examined the validity of our on-road driving assessment to quantify its outcomes.
  
  
  METHODS
  Older drivers (N = 127) completed a driving assessment on a standardized road course. Measurements included demographics, driving errors, and driving test outcomes; a categorical global rating score (pass-fail); and the sum of maneuvers (SMS) score (0-273).
  
  
  RESULTS
  There were significant differences in the SMS (F = 29.9, df = 1, p < or = .001) between drivers who passed the driving test and those who failed. The SMS cutoff value of 230 points was established as the criterion because it yielded the most optimal combination of sensitivity (0.91) and specificity (0.87). The strongest predictors of failure were adjustment to stimuli and lane maintenance errors.
  
  
  CONCLUSIONS
  The SMS differentiated between passing and failing drivers and can be used to inform clinical decision making.
authors.affiliation: Department of Occupational Therapy, College of Public Health and Health Professions, Institute for Mobility, Activity and Participation, National Older Driver Research and Training Center, University of Florida, PO Box 100164, University of Florida, Gainesville, FL 32610, USA. oshechtm@phhp.ufl.edu
authors.forename: Orit
authors.initials: O
authors.lastname: Shechtman
authors.forename: Kezia D
authors.initials: KD
authors.lastname: Awadzi
authors.forename: Sherrilene
authors.initials: S
authors.lastname: Classen
authors.forename: Desiree N
authors.initials: DN
authors.lastname: Lanford
authors.forename: Yongsung
authors.initials: Y
authors.lastname: Joo
mesh_terms: D000368:Aged; D001333:Automobile Driver Examination; D001334:Automobile Driving; D003663:Decision Trees; D005260:Female; D006801:Humans; D016015:Logistic Models; D008297:Male; D012372:ROC Curve; D012680:Sensitivity and Specificity; D012926:Social Control, Formal; D013647:Task Performance and Analysis