| Value | Category | Cases | |
|---|---|---|---|
| 0 | Unknown | 0 |
0%
|
| 1 | Pre-negative | 1511326 |
32.5%
|
| 2 | Negative | 839087 |
18%
|
| 3 | Post-negative | 1166115 |
25.1%
|
| 4 | Pre-positive | 405732 |
8.7%
|
| 5 | Positive | 724337 |
15.6%
|
| 9 | Error | 7164 |
0.2%
|
| Sysmiss | 4971658 |