| Value | Category | Cases | |
|---|---|---|---|
| 0 | 0. not at all | 1391 |
95.7%
|
| 1 | 1. once | 36 |
2.5%
|
| 2 | 2. 2-3 times | 17 |
1.2%
|
| 3 | 3. 4 or more times | 10 |
0.7%
|
| Sysmiss | 109 |