| Value |
Category |
| 1 |
month and year |
| 2 |
month and age -y imp |
| 5 |
year - a, m imp |
| 6 |
age - y, m imp |
| 7 |
month - a, y imp |
| 8 |
none - all imp |
| 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.