| Value | Category | Cases | |
|---|---|---|---|
| 0 | Never | 2871 |
99.5%
|
| 1 | Once | 6 |
0.2%
|
| 2 | Twice | 2 |
0.1%
|
| 3 | 3-5 times | 2 |
0.1%
|
| 4 | 6 times and more | 2 |
0.1%
|
| 5 | I do not know | 0 |
0%
|
| 6 | Not applicable | 2 |
0.1%
|
| Sysmiss | 1 |