| Value | Category | Cases | |
|---|---|---|---|
| -99 | Don't know | 0 |
0%
|
| -9 | Don't know (spontaneous) | 4 |
4%
|
| 0 | 10 |
10%
|
|
| 5 | 4 |
4%
|
|
| 10 | 6 |
6%
|
|
| 13 | 1 |
1%
|
|
| 15 | 5 |
5%
|
|
| 20 | 3 |
3%
|
|
| 25 | 2 |
2%
|
|
| 30 | 5 |
5%
|
|
| 35 | 1 |
1%
|
|
| 40 | 5 |
5%
|
|
| 42 | 1 |
1%
|
|
| 50 | 10 |
10%
|
|
| 60 | 9 |
9%
|
|
| 65 | 1 |
1%
|
|
| 70 | 8 |
8%
|
|
| 75 | 2 |
2%
|
|
| 80 | 10 |
10%
|
|
| 90 | 4 |
4%
|
|
| 95 | 2 |
2%
|
|
| 100 | 7 |
7%
|
|
| Sysmiss | 670 |