| Value | Category | Cases | |
|---|---|---|---|
| 1 | Month and year | 3421 |
94.4%
|
| 2 | From calendar | 11 |
0.3%
|
| 5 | Year | 174 |
4.8%
|
| 6 | Not coded | 0 |
0%
|
| 7 | Month | 0 |
0%
|
| 8 | None | 19 |
0.5%
|
| Sysmiss | 30971 |