| Value | Category | Cases | |
|---|---|---|---|
| 0 | Never | 3587 |
69.8%
|
| 1 | Once or twice | 1037 |
20.2%
|
| 2 | More often | 516 |
10%
|
| 9 | Missing | 17 | |
| Sysmiss | 2828 |