Definition
For children born in the 3 to 5 years before the survey, VACOPVL indicates whether the child has received a last dose of an oral polio vaccination. "Last" may refer to the child's most recent dose, and it may refer to the same vaccination as one referenced in another variable.
The oral polio vaccination primary series usually consists of a birth dose and 3 additional administrations. The variables VACOPV0 (H0), VACOPV1 (H4), VACOPV2 (H6), and VACOPV3 (H8) report the birth, first, second, and third administrations, respectively.
VACOPVL uses composite coding, with a first digit of 2 indicating the child has been vaccinated and the second digit indicating the source of information (a dated entry on the vaccination card, an undated mark on the vaccination card, or the mother's report).