| Value | Category | Cases | |
|---|---|---|---|
| 0 | Not at all | 4 |
3.1%
|
| 1 | Once per month | 1 |
0.8%
|
| 2 | Once per week | 4 |
3.1%
|
| 3 | Twice per week | 9 |
6.9%
|
| 4 | More than twice per week | 112 |
86.2%
|
| Sysmiss | 248 |