title: Knee pain and driving duration: a secondary analysis of the Taxi Drivers' Health Study.
abstract: OBJECTIVE
  We explored a postulated association between daily driving time and knee pain.
  
  
  METHODS
  We used data from the Taxi Drivers' Health Study to estimate 1-year prevalence of knee pain as assessed by the Nordic musculoskeletal questionnaire.
  
  
  RESULTS
  Among 1242 drivers, the prevalence of knee pain, stratified by duration of daily driving (< or = 6, > 6 through 8, > 8 through 10, and > 10 hours), was 11%, 17%, 19%, and 22%, respectively. Compared with driving 6 or fewer hours per day, the odds ratio of knee pain prevalence for driving more than 6 hours per day was 2.52 (95% confidence interval = 1.36, 4.65) after we adjusted for socioeconomic, work-related, and personal factors in the multiple logistic regression.
  
  
  CONCLUSIONS
  The dose-related association between driving duration and knee pain raises concerns about work-related knee joint disorders among professional drivers.
authors.affiliation: Occupational Health Program, Department of Environmental Health, Harvard School of Public Health, Boston, MA 02215, USA.
authors.forename: Jiu-Chiaun
authors.initials: JC
authors.lastname: Chen
authors.forename: Jack T
authors.initials: JT
authors.lastname: Dennerlein
authors.forename: Tung-Sheng
authors.initials: TS
authors.lastname: Shih
authors.forename: Chiou-Jong
authors.initials: CJ
authors.lastname: Chen
authors.forename: Yawen
authors.initials: Y
authors.lastname: Cheng
authors.forename: Wushou P
authors.initials: WP
authors.lastname: Chang
authors.forename: Louise M
authors.initials: LM
authors.lastname: Ryan
authors.forename: David C
authors.initials: DC
authors.lastname: Christiani
mesh_terms: D000041:Absenteeism; D000328:Adult; D001334:Automobile Driving; D003430:Cross-Sectional Studies; D005260:Female; D006801:Humans; D007588:Job Satisfaction; D007719:Knee Joint; D016015:Logistic Models; D008297:Male; D008875:Middle Aged; D009784:Occupational Diseases / Q000453:epidemiology* / Q000209:etiology / Q000523:psychology; D010146:Pain / Q000453:epidemiology* / Q000209:etiology / Q000523:psychology; D011159:Population Surveillance; D015995:Prevalence; D011634:Public Health; D012307:Risk Factors; D012680:Sensitivity and Specificity; D012959:Socioeconomic Factors; D011795:Surveys and Questionnaires; D013624:Taiwan / Q000453:epidemiology; D013997:Time Factors; D014504:Urban Health / Q000706:statistics & numerical data; D016526:Workload