| Value | Category | Cases | |
|---|---|---|---|
| 1 | Weekly | 479 |
1.9%
|
| 2 | Monthly | 900 |
3.7%
|
| 3 | Yearly | 1218 |
4.9%
|
| 4 | Less often | 2018 |
8.2%
|
| 5 | Not at all | 20035 |
81.3%
|
| Sysmiss | 510 |