| Value | Category | Cases | |
|---|---|---|---|
| 1 | Day | 4 |
11.4%
|
| 2 | Week | 7 |
20%
|
| 3 | Month | 15 |
42.9%
|
| 4 | Year | 8 |
22.9%
|
| 9 | Missing | 1 |
2.9%
|
| Sysmiss | 987 |