| Value | Category | Cases | |
|---|---|---|---|
| 1 | Weekly | 438 |
1.8%
|
| 2 | Monthly | 603 |
2.5%
|
| 3 | Yearly | 862 |
3.5%
|
| 4 | Less often | 1837 |
7.5%
|
| 5 | Not at all | 20852 |
84.8%
|
| Sysmiss | 516 |