| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 6 |
0.4%
|
| -7 | Does not apply (spontaneous) | 191 |
12.6%
|
| 1 | Yes | 74 |
4.9%
|
| 2 | No | 1247 |
82.1%
|