| Value | Category | Cases | |
|---|---|---|---|
| 1 | Every few days | 3 |
1.1%
|
| 2 | Every few weeks | 22 |
8.2%
|
| 3 | Every few months | 31 |
11.6%
|
| 4 | Not at all | 211 |
79%
|
| Sysmiss | 75 |