| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 76 |
2%
|
| -7 | Not applicable (spontaneous) | 306 |
8.1%
|
| 1 | Yes | 1074 |
28.5%
|
| 2 | No | 2319 |
61.4%
|