| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 1 |
0.3%
|
| -8 | Refusal (spontaneous) | 0 |
0%
|
| 0 | None | 73 |
20.3%
|
| 1 | Percentage | 184 |
51.1%
|
| 2 | Number | 102 |
28.3%
|