| Value | Category | Cases | |
|---|---|---|---|
| 0 | 0. not at all | 1366 |
95.6%
|
| 1 | 1. once | 49 |
3.4%
|
| 2 | 2. 2-3 times | 11 |
0.8%
|
| 3 | 3. 4 or more times | 3 |
0.2%
|
| Sysmiss | 134 |