title: The epidemiology of upper extremity musculoskeletal symptoms on a college campus.
abstract: OBJECTIVE
  The study examines temporal variations in upper-extremity musculoskeletal symptoms throughout the day, over a week and throughout the semester.
  
  
  METHODS
  30 undergraduates were followed in a repeated measures study throughout a semester. Upper extremity musculoskeletal symptoms data were collected on handheld computers randomly throughout the day for seven days over three data collection periods. Multilevel statistical models evaluated associations between time-related predictors and symptoms.
  
  
  RESULTS
  In adjusted models, pain reported at baseline was associated with increased odds of experiencing both any symptoms (OR=15.64; 90% CI 7.22-33.88) and moderate or greater symptoms (OR=16.44; 90% CI 4.57-29.99). Any symptoms were less likely to be reported if responses occurred at 58-76 days (OR=0.66; 90% CI 0.49-0.86), 77-90 days (OR=0.29; 90% CI 0.20-0.42) and 91-117 days (OR=0.54; 90% CI 0.39-0.75) into the semester compared to 35-57 days. Similarly, responding after midnight was associated with greater odds of reporting moderate or greater symptoms (OR=21.33; 90% CI 6.49-65.97). There was no association observed for day of week and symptoms.
  
  
  CONCLUSIONS
  This pilot work suggests upper extremity musculoskeletal symptoms exhibit temporal variations related to time of day and days into semester. Understanding the natural history of musculoskeletal symptoms and disorders is needed when designing epidemiologic research and/or intervention studies using symptom outcome measures.
authors.affiliation: The University of Texas School of Public Health, Houston, TX, USA. CMenendez@cdc.gov
authors.forename: Cammie
authors.initials: C
authors.lastname: Chaumont Menéndez
authors.forename: Benjamin C
authors.initials: BC
authors.lastname: Amick Iii
authors.forename: Che-Hsu
authors.initials: CH
authors.lastname: Joe Chang
authors.forename: Jack T
authors.initials: JT
authors.lastname: Dennerlein
authors.forename: Ronald B
authors.initials: RB
authors.lastname: Harrist
authors.forename: Mark
authors.initials: M
authors.lastname: Jenkins
authors.forename: Michelle
authors.initials: M
authors.lastname: Robertson
authors.forename: Jeffrey N
authors.initials: JN
authors.lastname: Katz
mesh_terms: D000293:Adolescent; D003625:Data Collection; D005260:Female; D006801:Humans; D008297:Male; D009140:Musculoskeletal Diseases / Q000453:epidemiology*; D010147:Pain Measurement; D013334:Students / Q000706:statistics & numerical data; D014495:Universities; D034941:Upper Extremity / Q000503:physiopathology*; D014584:User-Computer Interface; D055815:Young Adult