title: Time variations in injury incidence.
abstract: OBJECTIVE
  to present time variations in the incidence of injuries on a community level.
  
  
  METHODS
  all injuries which occurred in a defined population of the municipality of Harstad were registered prospectively from 1 January 1986 to 31 December 1991. Variations over time in monthly incidence of seven types of injuries (home, traffic, street, sports, work, other, unknown) were analysed by the Autoregressive Integrated Moving Average Analysis (ARIMA).
  
  
  RESULTS
  a total of 9,685 injuries was registered during the six year follow-up period. No significant secular trend was observed for any of the analysed types of injuries. Series of monthly incidence of traffic, street, and sports injuries showed seasonal-dependent variations. Incidence of traffic injuries was highest during the summer months, while incidence of sports and street injuries was highest during the winter months.
  
  
  CONCLUSIONS
  both the existence of seasonal dependency in injury incidence and the relatively high random variations in monthly injury incidence imply that evaluation of community based injury control programmes should include incidence during at least a one year period before the intervention has started.
authors.affiliation: National Institute of Public Health, Oslo, Norway.
authors.forename: B
authors.initials: B
authors.lastname: Kopjar
authors.forename: B
authors.initials: B
authors.lastname: Guldvog
mesh_terms: D003153:Community Health Services; D006801:Humans; D015994:Incidence; D015233:Models, Statistical; D009664:Norway / Q000453:epidemiology; D011159:Population Surveillance; D011446:Prospective Studies; D012042:Registries; D012044:Regression Analysis; D012621:Seasons; D013997:Time Factors; D014505:Urban Population; D014947:Wounds and Injuries / Q000145:classification / Q000453:epidemiology* / Q000517:prevention & control