| Value | Category | Cases | |
|---|---|---|---|
| 0 | 0. not at all | 1396 |
97.7%
|
| 1 | 1. once | 21 |
1.5%
|
| 2 | 2. 2-3 times | 10 |
0.7%
|
| 3 | 3. 4 or more times | 2 |
0.1%
|
| Sysmiss | 134 |