| Value | Category | Cases | |
|---|---|---|---|
| 1 | Every few days | 9 |
2.5%
|
| 2 | Every few weeks | 33 |
9.2%
|
| 3 | Every few months | 137 |
38.4%
|
| 4 | Not at all | 178 |
49.9%
|
| Sysmiss | 64 |