| Value | Category | Cases | |
|---|---|---|---|
| 1 | Every few days | 9 |
1.8%
|
| 2 | Every few weeks | 31 |
6.4%
|
| 3 | Every few months | 119 |
24.4%
|
| 4 | Not at all | 328 |
67.4%
|
| Sysmiss | 18 |