| Value | Category | Cases | |
|---|---|---|---|
| 1 | Weekly | 276 |
1.1%
|
| 2 | Monthly | 522 |
2.1%
|
| 3 | Yearly | 858 |
3.5%
|
| 4 | Less often | 1630 |
6.6%
|
| 5 | Not at all | 21481 |
86.7%
|
| Sysmiss | 817 |