| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 18 |
100%
|
| 1 | Never | 0 | |
| 2 | Once a week | 0 | |
| 3 | Between 2 and 4 times a week | 0 | |
| 4 | Daily | 0 | |
| 5 | More than once a day | 0 |