| Value | Category | Cases | |
|---|---|---|---|
| 1 | Scar present | 21 |
1.1%
|
| 2 | Scar absent | 6 |
0.3%
|
| 3 | No information | 963 |
51.3%
|
| 5 | miss | 1 |
0.1%
|
| 9 | na | 886 |
47.2%
|
| Sysmiss | 881 |