title: Neonatal jaundice is a risk factor for childhood asthma: a retrospective cohort study.
abstract: BACKGROUND
  The association between neonatal jaundice and childhood asthma is a new finding of two reports. The purpose of the study was to verify their results.
  
  
  METHODS
  Data from 11,321 children were collected from the National Health Insurance Research Database. Their claims data were evaluated from birth to 10 yr old. Children were analyzed as case (those with neonatal jaundice) and controls (those without neonatal jaundice). The diagnostic criteria for asthma were as follows: at least four asthma diagnoses at outpatient services and emergency department (ED), or one asthma diagnosis during an admission. In children fitting the asthma criteria, those with no asthma diagnosis after 1 yr of age were excluded. Mantel-Haenszel's odds ratios were calculated after adjustment for the following confounders: preterm/low birth weight, neonatal infection, other respiratory conditions, other birth conditions, and gender. Asthma rate, onset time, the use of drugs, upper respiratory infection and lower respiratory infection (LRI) rates, hospital admission/ED visit rates, and the effect of phototherapy were evaluated.
  
  
  RESULTS
  After adjustment for the confounding factors, the rate of asthma was higher in icteric children (OR: 1.64, 95% CI 1.36-1.98, p < 0.001), and the influence in females was stronger. There still was an association between neonatal jaundice and late onset asthma (asthma onset after 3 yr of age). In asthmatic children, those with neonatal jaundice have increased asthma onset rate before age 6, increased use of inhalant steroids, LRI rates, and ED visits for respiratory disease.
  
  
  CONCLUSIONS
  Neonatal jaundice increased the rate and severity of childhood asthma in subjects aged up to 10 yr and may be a risk factor for childhood asthma.
authors.affiliation: Institute of Medicine, Chung Shan Medical University, Taichung, Taiwan.
authors.forename: Min-Sho
authors.initials: MS
authors.lastname: Ku
authors.forename: Hai-Lun
authors.initials: HL
authors.lastname: Sun
authors.forename: Ji-Nan
authors.initials: JN
authors.lastname: Sheu
authors.forename: Hong-Shen
authors.initials: HS
authors.lastname: Lee
authors.forename: Shun-Fa
authors.initials: SF
authors.lastname: Yang
authors.forename: Ko-Huang
authors.initials: KH
authors.lastname: Lue
mesh_terms: D017668:Age of Onset; D001249:Asthma / Q000453:epidemiology*; D002648:Child; D002675:Child, Preschool; D015331:Cohort Studies; D005260:Female; D006760:Hospitalization; D006801:Humans; D007223:Infant; D007231:Infant, Newborn; D007239:Infections / Q000453:epidemiology*; D007567:Jaundice, Neonatal / Q000453:epidemiology*; D008297:Male; D012189:Retrospective Studies; D012307:Risk Factors; D012737:Sex Factors