| Value | Category | Cases | |
|---|---|---|---|
| 0 | No | 2288 |
29.1%
|
| 1 | Yes, spontaneously | 2871 |
36.5%
|
| 2 | Yes, probed | 2706 |
34.4%
|
| 8 | Not asked | 0 |
0%
|