Table 1.

Stage 3 Study Population (Aged 3–6 Years) by Vaccine Received, Gender, Length of Follow-Up, and Frequency of Nursery School/Kindergarten Attendance

Vaccine Received
DTaP SBDTaP CBDT
Gender
 Boys20892093592
 Girls21282122530
 Total421742151122
Person-months of follow-up129 324130 08327 611
 Average per child (mo)30.730.924.6
Proportion months in nursery
school/kindergarten
 Never29.9%29.6%28.1%
 Rarely2.5%2.6%2.6%
 Often13.3%13.4%12.0%
 Always54.3%54.4%57.3%
 Total100%100%100%