| Value | Category | Cases | |
|---|---|---|---|
| 1 | Month | 35 |
1.2%
|
| 2 | Week | 5 |
0.2%
|
| 3 | Day | 15 |
0.5%
|
| 99 | Do not know | 5 |
0.2%
|
| Sysmiss | 2756 |
97.9%
|