| Value | Category | Cases | |
|---|---|---|---|
| 1 | 1. Per week | 29 |
1.2%
|
| 2 | 2. Per 2 weeks | 4 |
0.2%
|
| 3 | 3. Per month | 2332 |
95.8%
|
| 4 | 4.Per 2 months | 22 |
0.9%
|
| 5 | 46 |
1.9%
|
|
| Sysmiss | 4148 |