| Value | Category | Cases | |
|---|---|---|---|
| 1 | once a day | 8795 |
49.8%
|
| 2 | once a week | 1996 |
11.3%
|
| 3 | once a month | 565 |
3.2%
|
| 4 | as required | 6304 |
35.7%
|
| Sysmiss | 97972 |