| Value | Category | Cases | |
|---|---|---|---|
| 1 | Weekly | 129 |
0.5%
|
| 2 | Monthly | 203 |
0.8%
|
| 3 | Yearly | 966 |
3.9%
|
| 4 | Less often | 1527 |
6.2%
|
| 5 | Not at all | 21767 |
88.5%
|
| Sysmiss | 516 |