| Value |
Category |
| 0 |
Blank |
| 1 |
January |
| 2 |
February |
| 3 |
March |
| 4 |
April |
| 5 |
May |
| 6 |
June |
| 7 |
July |
| 8 |
August |
| 9 |
September |
| 10 |
October |
| 11 |
November |
| 12 |
December |
| 97 |
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.
