Warning: these figures indicate the number of cases found in the data file. They cannot be interpreted as summary statistics of the population of interest.
Description
Source of information
SDQ33: When was the first polio vaccine received, just after birth or later?
Imputation and derivation
Imputation
SDQ33: When was the first polio vaccine received, just after birth or later?
Others
Security
SDQ33: When was the first polio vaccine received, just after birth or later?