| Value | Category | Cases | |
|---|---|---|---|
| 1 | Every few days | 3 |
0.7%
|
| 2 | Every few weeks | 22 |
4.8%
|
| 3 | Every few months | 106 |
23.1%
|
| 4 | Not at all | 328 |
71.5%
|
| Sysmiss | 46 |