| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 31 |
5.4%
|
| 1 | Never | 63 |
11%
|
| 2 | Once a week | 288 |
50.4%
|
| 3 | Between 2 and 4 times a week | 167 |
29.2%
|
| 4 | Daily | 20 |
3.5%
|
| 5 | More than once a day | 2 |
0.4%
|
| Sysmiss | 1092 |