A) copy dates for each vaccination from the card.
(b) record 4444 in the corresponding year column if the card shows that a vaccination was given, but no date recorded.
- polio 3
Categories
Value
Category
0
Not received
2007
2008
2009
2010
2011
2012
4444
No date recorded
6666
Mother's report
9999
Missing
Sysmiss
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.