title: Multiple Conditions Increase Preventable Crash Risks Among Truck Drivers in a Cohort Study.
abstract: This study aims to quantify the crash risk for truck drivers with multiple comorbid medical conditions, after adjusting for confounders.
  
  
  
  This retrospective cohort of 38,184 drivers evaluated concomitant medical conditions and subsequent crash data between January 1, 2005, and October 31, 2012. Hazard ratios (HRs) and 95% confidence intervals (95% CIs) were calculated for any cause and preventable crashes of varying severity.
  
  
  
  Drivers with three or more medical conditions had a significantly increased risk of preventable Department of Transportation (DOT) reportable crashes (HR = 2.53, 95% CI = 1.65 to 3.88) and preventable crashes with injuries (HR = 2.23, 95% CI = 1.09 to 5.31) after adjustment for covariates. Similarly, adjusted HRs were 2.55 (95% CI = 1.37 to 4.73) for any cause DOT-reportable crashes and 3.21 (95% CI = 1.18 to 8.75) for any cause crashes with injuries.
  
  
  
  Having three concomitant medical conditions may be a statistically significant risk factor for preventable and any cause DOT-reportable crashes and crashes with injuries.
authors.affiliation: Rocky Mountain Center for Occupational & Environment Health, Department of Family and Preventive Medicine, School of Medicine, University of Utah, Salt Lake City, Utah (Drs Thiese, Hegmann); Center for Truck and Bus Safety, Virginia Tech Transportation Institute, Blacksburg, Virginia (Dr Hanowski); Department of Environmental Health, Harvard TH Chan School of Public Health, Boston, Massachusetts, Occupational Medicine, Cambridge Health Alliance/Harvard Medical School, Cambridge, Massachusetts (Dr Kales); Department of Civil & Environmental Engineering, College of Engineering, University of Utah, Salt Lake City, Utah (Dr Porter); Arkansas Occupational Health Clinic, Springdale, Arkansas (Dr Moffitt); and Department of Internal Medicine, School of Medicine, University of Utah, Salt Lake City, Utah (Dr Hu).
authors.forename: Matthew S
authors.initials: MS
authors.lastname: Thiese
authors.forename: Richard J
authors.initials: RJ
authors.lastname: Hanowski
authors.forename: Stefanos N
authors.initials: SN
authors.lastname: Kales
authors.forename: Richard J
authors.initials: RJ
authors.lastname: Porter
authors.forename: Gary
authors.initials: G
authors.lastname: Moffitt
authors.forename: Nan
authors.initials: N
authors.lastname: Hu
authors.forename: Kurt T
authors.initials: KT
authors.lastname: Hegmann
mesh_terms: D000063:Accidents, Traffic / Q000517:prevention & control / Q000706:statistics & numerical data*; D000328:Adult; D002908:Chronic Disease / Q000453:epidemiology*; D015897:Comorbidity; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D018986:Motor Vehicles; D016272:Occupational Health; D012189:Retrospective Studies; D018570:Risk Assessment; D012307:Risk Factors; D014481:United States / Q000453:epidemiology; D014947:Wounds and Injuries / Q000453:epidemiology