| Value | Category | Cases | |
|---|---|---|---|
| 1 | Merely by looking at him | 498 |
5.9%
|
| 2 | By medical examination | 5078 |
60.4%
|
| 3 | By blood test | 2141 |
25.5%
|
| 4 | Other (specify) | 22 |
0.3%
|
| 5 | Do not know | 667 |
7.9%
|
| 9 | 1 |
0%
|
|
| Sysmiss | 3602 |