Table 2

Summary of demographic characteristics of study subjects

Age at first immunisationMedian 61 days (range 42–180)
Sex of infant1418 male (51%), 1378 female (49%)
Ethnic originWhite, non-hispanic 2707 (97%), others 89 (3%)
Gestational age at birthMedian 40 weeks (range 34–44)
Birth weightMedian 3.4 kg (range 1.6–5.5)
  • Ranges for birth weight and gestational age are outside that defined in the inclusion criteria as all infants (including those who deviated from protocol) are included in the safety analysis.