| Value |
Category |
| 1 |
Once per month |
| 2 |
Once per quarter |
| 3 |
Twice a year |
| 4 |
Annually |
| 5 |
In nine months |
| 6 |
To the extent of admission and discharge |
| 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.