title: Incidence of multiple sclerosis in Hordaland, western Norway: a fluctuating pattern.
abstract: The incidence of multiple sclerosis (MS) was studied in the county of Hordaland, western Norway. A significant increase in incidence in the period 1958-1987, a decline followed by a gradual increase in mean age at onset, geographic differences in time trends and a biphasic pattern revealed by a birth cohort analysis support the theory of real time-space fluctuations in the incidence of MS over time.
authors.affiliation: Department of Neurology, Haukeland University Hospital, Bergen, Norway.
authors.forename: M
authors.initials: M
authors.lastname: Grønning
authors.forename: T
authors.initials: T
authors.lastname: Riise
authors.forename: G
authors.initials: G
authors.lastname: Kvåle
authors.forename: H
authors.initials: H
authors.lastname: Nyland
authors.forename: J P
authors.initials: JP
authors.lastname: Larsen
authors.forename: J A
authors.initials: JA
authors.lastname: Aarli
mesh_terms: D000328:Adult; D003431:Cross-Cultural Comparison; D003430:Cross-Sectional Studies; D006801:Humans; D015994:Incidence; D009103:Multiple Sclerosis / Q000145:classification / Q000453:epidemiology* / Q000209:etiology; D009664:Norway / Q000453:epidemiology; D012307:Risk Factors; D012424:Rural Population; D014505:Urban Population