| Value | Category | Cases | |
|---|---|---|---|
| 0 | No | 1196 |
96.1%
|
| 1 | Yes, once | 26 |
2.1%
|
| 2 | Yes, more than once | 23 |
1.8%
|
| 9 | 6 | ||
| Sysmiss | 180 |