| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 3 |
0.3%
|
| 0 | 995 |
99.3%
|
|
| 2 | 1 |
0.1%
|
|
| 50 | 2 |
0.2%
|
|
| 80 | 1 |
0.1%
|