Value |
Category |
1 |
Month and year |
2 |
Month and age |
3 |
Year and age |
4 |
Year |
5 |
Year, age and month imputed |
6 |
Age |
7 |
Month |
8 |
None |
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.