| Value | Category | Cases | |
|---|---|---|---|
| 0 | 4 |
0.1%
|
|
| 1 | yes | 4 |
0.1%
|
| 2 | no | 4169 |
99.8%
|
| 77 | don't know | 0 |
0%
|
| Sysmiss | 323 |