| Value | Category | Cases | |
|---|---|---|---|
| 0 | Never | 3139 |
99.7%
|
| 1 | Once | 6 |
0.2%
|
| 2 | More than once | 4 |
0.1%
|
| 3 | Not applicable | 0 |
0%
|
| Sysmiss | 1 |