Table 1 "Age 2 and under" and "Age 6" eligibility and up-to-date status criteria

>= 24 months old

Birth to 15 months of age

At age 2

4 DtaP, 3 IPV, 1 MMR, 3 Hib, 3 HBV

>= 18 and < 24 months

Birth to 15 months of age

at 12/31/2001

4 DtaP, 3 IPV, 1 MMR, 3 Hib, 3 HBV

>= 15 and < 18 months

Birth to 15 months of age

at 12/31/2001

3 DtaP, 2 IPV, 1 MMR, 3 Hib, 2 HBV

>= 6 and < 15 months

Birth to 12/31/2001

at 12/31/2001

3 DtaP, 2 IPV, 2 Hib, 2 HBV

>= 4 and < 6 months

Birth to 12/31/2001

at 12/31/2001

2 DtaP, 2 IPV, 2 Hib, 2 HBV

< 4 months

Not eligible for "age 2 and under" sub-study

Age by 12/31/01

Enrollment criteria ^a

Up-to-date status evaluated at

Up-to-date status criteria ^b

>= 6 years old

Enrolled at age 6

At age 6

5 DtaP/DTP, 4 IPV/OPV, 2 MMR, 3 Hib, 3 HBV

< 6 years old

Not eligible for "age 6" sub-study