| Value | Category | Cases | |
|---|---|---|---|
| 0 | No | 22494 |
97%
|
| 1 | Yes, once | 323 |
1.4%
|
| 2 | Yes, more than once | 367 |
1.6%
|
| 9 | Missing | 568 | |
| Sysmiss | 10844 |