title: Neonatal vitamin D status and risk of multiple sclerosis.
abstract: OBJECTIVE
  Low vitamin D status at birth may be associated with risk of adult onset multiple sclerosis, but this link has not been studied directly. We assessed the relation between neonatal vitamin D concentrations, measured in stored blood samples, and risk of multiple sclerosis.
  
  
  METHODS
  This was a population-based case-control study in Sweden including 459 incident cases of multiple sclerosis and 663 controls, randomly drawn from a national population registry and frequency matched on sex, age, and residential area.
  
  
  RESULTS
  There was no association between neonatal 25-hydroxyvitamin D quintile and risk of multiple sclerosis (crude odds ratio = 1.0, 95% confidence interval = 0.68-1.44, for the highest quintile compared to the lowest). Adjusting for a number of potential confounding factors in early life (month of birth, latitude of birth, breastfeeding) and in adult life (25-hydroxyvitamin D, sun exposure, vitamin D intake from dairy products, fatty fish consumption, smoking, body mass index at 20 years of age) as well as ancestry, multiple sclerosis heredity, and socioeconomic group did not considerably affect the result.
  
  
  CONCLUSIONS
  At a broad population level, 25-hydroxyvitamin D at birth was not associated with risk of multiple sclerosis.
authors.affiliation: Clinical Epidemiology Unit, Department of Medicine, Solna, Karolinska Institutet, Stockholm, Sweden.
authors.forename: Peter
authors.initials: P
authors.lastname: Ueda
authors.forename: Farshid
authors.initials: F
authors.lastname: Rafatnia
authors.forename: Maria
authors.initials: M
authors.lastname: Bäärnhielm
authors.forename: Robin
authors.initials: R
authors.lastname: Fröbom
authors.forename: Greg
authors.initials: G
authors.lastname: Korzunowicz
authors.forename: Ragnar
authors.initials: R
authors.lastname: Lönnerbro
authors.forename: Anna Karin
authors.initials: AK
authors.lastname: Hedström
authors.forename: Darryl
authors.initials: D
authors.lastname: Eyles
authors.forename: Tomas
authors.initials: T
authors.lastname: Olsson
authors.forename: Lars
authors.initials: L
authors.lastname: Alfredsson
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D016022:Case-Control Studies; D005260:Female; D006801:Humans; D007231:Infant, Newborn / Q000097:blood*; D008297:Male; D008875:Middle Aged; D009103:Multiple Sclerosis / Q000453:epidemiology / Q000209:etiology*; D012042:Registries; D012306:Risk; D013548:Sweden / Q000453:epidemiology; D014807:Vitamin D / Q000031:analogs & derivatives* / Q000097:blood; D055815:Young Adult
chemical_list: D014807:Vitamin D; C104450:25-hydroxyvitamin D