| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 0 |
0%
|
| 0 | 502 |
96.7%
|
|
| 10 | 1 |
0.2%
|
|
| 20 | 9 |
1.7%
|
|
| 30 | 3 |
0.6%
|
|
| 40 | 2 |
0.4%
|
|
| 60 | 1 |
0.2%
|
|
| 80 | 1 |
0.2%
|