| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 1 |
0.4%
|
| 1 | Never | 29 |
10.8%
|
| 2 | Once a week | 158 |
58.7%
|
| 3 | Between 2 and 4 times a week | 59 |
21.9%
|
| 4 | Daily | 15 |
5.6%
|
| 5 | More than once a day | 7 |
2.6%
|
| Sysmiss | 491 |