| Value | Category | Cases | |
|---|---|---|---|
| 0 | 31 |
0.4%
|
|
| 1 | Week | 3661 |
46.7%
|
| 2 | Month | 4146 |
52.9%
|
| 9 | Not stated | 0 |
0%
|
| Sysmiss | 39361 |