| Value | Category | Cases | |
|---|---|---|---|
| 1 | Every few days | 15 |
3.1%
|
| 2 | Every few weeks | 24 |
4.9%
|
| 3 | Every few months | 139 |
28.4%
|
| 4 | Not at all | 311 |
63.6%
|
| Sysmiss | 16 |