| Value | Category | Cases | |
|---|---|---|---|
| 18 | 1 |
3.3%
|
|
| 77 | Don't know | 8 |
26.7%
|
| 88 | No applicable | 0 |
0%
|
| 99 | Missing | 21 |
70%
|
| Sysmiss | 4712 |