| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 3 |
0.9%
|
| -7 | Does not apply (spontaneous) | 4 |
1.2%
|
| 1 | Yes | 54 |
15.7%
|
| 2 | No | 284 |
82.3%
|