| Value | Category | Cases | |
|---|---|---|---|
| 1 | Every few days | 2 |
0.8%
|
| 2 | Every few weeks | 3 |
1.3%
|
| 3 | Every few months | 39 |
16.4%
|
| 4 | Not at all | 194 |
81.5%
|
| Sysmiss | 25 |