To determine whether an association exists between immunization status and birth order.
Medical record review of immunization dates for matched siblings.
Pediatric clinic at a university medical center.
A total of 892 children (446 sibling pairs of firstborn and secondborn children) born between 1983 and 1991 who received regular pediatric care at the clinic.
Median ages at which firstborn children and their secondborn siblings had been immunized with the intitial four doses of diphtheria and tetanus toxoids and pertussis vaccine (DTP1, DTP2, DTP3, and DPT4) and the initial dose of measles-mumps-rubella vaccine ; point prevalences of firstborn and secondborn children up-to-date with all immunizations at each month of life to 2 years of age.
Between 5 and 12 months of life, the percentage of secondborn children who were fully immunized was significantly lower than the percentage of fully immunized firstborn children (P values ranging from<. 0001 to<. 05).
Firstborn children were much more likely than their secondborn siblings to have been immunized on time with DTP2 (z=3.80, P=0001) and DTP3 (z=3.31, P=0009).
Secondborn children are likely to be immunized later than firstborn children.
Secondborn children with an older sibling who was immunized late are at particular risk for delayed immunizations.
Mots-clés Pascal : Vaccination, Prévention, Nourrisson, Homme, Rang naissance, Délai, New York, Etats Unis, Amérique du Nord, Amérique
Mots-clés Pascal anglais : Vaccination, Prevention, Infant, Human, Birth order, Time lag, New York, United States, North America, America
Notice produite par :
Inist-CNRS - Institut de l'Information Scientifique et Technique
Cote : 95-0414190
Code Inist : 002B05A02. Création : 01/03/1996.