| Value | Category | Cases | |
|---|---|---|---|
| -99 | Don't know | 0 |
0%
|
| -9 | Don't know (spontaneous) | 0 |
0%
|
| 0 | 162 |
97%
|
|
| 2 | 1 |
0.6%
|
|
| 5 | 1 |
0.6%
|
|
| 20 | 1 |
0.6%
|
|
| 65 | 1 |
0.6%
|
|
| 80 | 1 |
0.6%
|
|
| Sysmiss | 73 |