| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 8 |
5.1%
|
| -8 | Refusal (spontaneous) | 3 |
1.9%
|
| 0 | 35 |
22.3%
|
|
| 15 | 110 |
70.1%
|
|
| 46 | 1 |
0.6%
|