| Value | Category | Cases | |
|---|---|---|---|
| 1 | Weekly | 344 |
1.4%
|
| 2 | Monthly | 624 |
2.5%
|
| 3 | Yearly | 853 |
3.5%
|
| 4 | Less often | 1504 |
6.1%
|
| 5 | Not at all | 21325 |
86.5%
|
| Sysmiss | 510 |