| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 13 |
2.2%
|
| -8 | Refusal (spontaneous) | 6 |
1%
|
| 0 | None | 22 |
3.7%
|
| 1 | Percentage | 514 |
85.5%
|
| 2 | Number | 46 |
7.7%
|