| Value | Category | Cases | |
|---|---|---|---|
| 1 | Every few days | 10 |
3.3%
|
| 2 | Every few weeks | 30 |
9.9%
|
| 3 | Every few months | 49 |
16.1%
|
| 4 | Not at all | 215 |
70.7%
|
| Sysmiss | 51 |