| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 3 |
0.5%
|
| 0 | 594 |
99%
|
|
| 15 | 1 |
0.2%
|
|
| 40 | 1 |
0.2%
|
|
| 60 | 1 |
0.2%
|