| Value | Category | Cases | |
|---|---|---|---|
| -99 | Don't know | 0 |
0%
|
| -9 | Don't know (spontaneous) | 1 |
2.3%
|
| 5 | 1 |
2.3%
|
|
| 10 | 10 |
22.7%
|
|
| 20 | 19 |
43.2%
|
|
| 30 | 5 |
11.4%
|
|
| 50 | 8 |
18.2%
|
|
| Sysmiss | 318 |