| Value | Category | Cases | |
|---|---|---|---|
| 1 | Every few days | 4 |
1.4%
|
| 2 | Every few weeks | 14 |
4.7%
|
| 3 | Every few months | 75 |
25.3%
|
| 4 | Not at all | 203 |
68.6%
|
| -99 | 8 | ||
| Sysmiss | 56 |