| Value | Category | Cases | |
|---|---|---|---|
| 1 | Every few days | 1 |
0.4%
|
| 2 | Every few weeks | 18 |
6.3%
|
| 3 | Every few months | 66 |
23.2%
|
| 4 | Not at all | 200 |
70.2%
|
| Sysmiss | 90 |