| Value | Category | Cases | |
|---|---|---|---|
| 3 | 2 |
3.1%
|
|
| 10 | 2 |
3.1%
|
|
| 20 | 1 |
1.6%
|
|
| 30 | 6 |
9.4%
|
|
| 60 | 10 |
15.6%
|
|
| 70 | 1 |
1.6%
|
|
| 90 | 38 |
59.4%
|
|
| 120 | 2 |
3.1%
|
|
| 998 | don't know | 2 |
3.1%
|
| Sysmiss | 340 |