| Value | Category | Cases | |
|---|---|---|---|
| 1 | Merely by looking at him | 2 |
0.4%
|
| 2 | By medical examination | 1 |
0.2%
|
| 3 | By blood test | 389 |
80%
|
| 4 | Other (specify) | 61 |
12.6%
|
| 5 | Do not know | 32 |
6.6%
|
| 9 | 1 |
0.2%
|
|
| Sysmiss | 11523 |