Lower respiratory tract infections among Norwegian infants with siblings in day care

Am J Public Health. 1996 Oct;86(10):1456-9. doi: 10.2105/ajph.86.10.1456.


Objectives: The purpose of this study was to assess the role of siblings in day care as a determinant of infants' risk of lower respiratory tract infections.

Methods: A total of 3238 children (86%) out of 3754 Oslo, Norway, newborns recruited in 1992/93 were followed for 1 year.

Results: In logistic regression analysis, the risk of infection was increased in (1) infants with one or more siblings compared with infants without siblings (adjusted odds ratio [OR] = 2.3; 95% confidence interval [CI] = 1.84, 2.85) and (2) infants with one or more siblings in day care compared with infants with siblings not in day care (adjusted OR = 1.7; 95% CI = 1.21, 2.26).

Conclusions: The results suggest that siblings in day care outside the home increase infants' risk of lower respiratory tract infections.

Publication types

  • Comparative Study
  • Research Support, Non-U.S. Gov't

MeSH terms

  • Cohort Studies
  • Day Care, Medical*
  • Environmental Exposure
  • Family Health*
  • Hospitalization
  • Humans
  • Infant
  • Infant, Newborn
  • Logistic Models
  • Norway / epidemiology
  • Nuclear Family*
  • Reproducibility of Results
  • Respiratory Tract Infections / epidemiology
  • Respiratory Tract Infections / etiology*