VACOPV1DAY (H4D) reports the day of the month that children received their first oral polio vaccination. This information is only available for children born in the 3 to 5 years before the survey whose first oral polio vaccination date was recorded on a card shown to the interviewer.
The complementary variables VACOPV1MO (H4M) and VACOPV1YR (H4Y) report the month and the year of the first oral polio vaccination, as recorded on a vaccination card shown to the interviewer.
According to the DHS Recode Manuals, the vaccination date may be coded as "Inconsistent" if the reported date is inconsistent with the date of birth, the date of interview, or the dates of other vaccinations.
To identify all young children who received the first oral polio vaccination, including those identified through the mother's report rather than a dated vaccination card, see VACOPV1 (H4).