title: ALS incidence in Nova Scotia over a 20-year-period: a prospective study.
abstract: OBJECTIVE
  Previous studies have suggested that the incidence of amyotrophic lateral sclerosis (ALS) in Nova Scotia is relatively high and increasing over time. This study was performed to determine the current incidence of ALS in Nova Scotia and to compare this to data collected in 1984 and 1995.
  
  
  METHODS
  All physiatrists and neurologists were surveyed on a monthly basis over one year to record all new cases of ALS diagnosed in Nova Scotia. Data was compared to that collected using similar methods in 1984 and 1995. To validate our methods, we also performed a retrospective study using a provincial health care database.
  
  
  RESULTS
  There were 21 new ALS cases in Nova Scotia during the 2003 study period, yielding a crude incidence of 2.24/100,000. The age-adjusted incident rate for 2003 was 2.13 (95% CI = 0.11-4.15). The age-adjusted rate for 1995 was 2.3 (95% CI = 0.08-4.53) while the age-adjusted rate for 1984 was 2.22 (95% CI = 0.13-4.32). Analysis of provincial health records identified 24 cases of ALS and an age-adjusted incidence of 2.44/100,000.
  
  
  CONCLUSIONS
  The age-adjusted incidence of ALS in Nova Scotia has remained stable over the period 1984-2003. The incidence is similar to that reported in several other parts of the world.
authors.affiliation: Faculty of Medicine, Dalhousie University, Halifax, NS, Canada.
authors.forename: J P
authors.initials: JP
authors.lastname: Bonaparte
authors.forename: I A
authors.initials: IA
authors.lastname: Grant
authors.forename: T J
authors.initials: TJ
authors.lastname: Benstead
authors.forename: T J
authors.initials: TJ
authors.lastname: Murray
authors.forename: M
authors.initials: M
authors.lastname: Smith
mesh_terms: D000328:Adult; D017677:Age Distribution; D000368:Aged; D000690:Amyotrophic Lateral Sclerosis / Q000453:epidemiology*; D015331:Cohort Studies; D005260:Female; D006801:Humans; D015994:Incidence; D008297:Male; D008875:Middle Aged; D009674:Nova Scotia / Q000453:epidemiology; D011446:Prospective Studies; D012189:Retrospective Studies