| Value | Category | Cases | |
|---|---|---|---|
| 1 | Present | 386 |
1.6%
|
| 2 | Not present | 23751 |
97.4%
|
| 3 | Unsure | 97 |
0.4%
|
| 7 | Not checked | 49 |
0.2%
|
| 9 | Missing | 97 |
0.4%
|
| Sysmiss | 1637 |