| Value | Category | Cases | |
|---|---|---|---|
| 0 | Unknown | 0 |
0%
|
| 1 | Pre-negative | 1513002 |
34.3%
|
| 2 | Negative | 838653 |
19%
|
| 3 | Post-negative | 993899 |
22.5%
|
| 4 | Pre-positive | 405976 |
9.2%
|
| 5 | Positive | 658161 |
14.9%
|
| 9 | Error | 7189 |
0.2%
|
| Sysmiss | 4572377 |