| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 2 |
1.8%
|
| 0 | 14 |
12.5%
|
|
| 1 | One minute or less | 12 |
10.7%
|
| 10 | 6 |
5.4%
|
|
| 15 | 7 |
6.3%
|
|
| 20 | 4 |
3.6%
|
|
| 25 | 1 |
0.9%
|
|
| 30 | 46 |
41.1%
|
|
| 35 | 3 |
2.7%
|
|
| 40 | 4 |
3.6%
|
|
| 45 | 8 |
7.1%
|
|
| 50 | 3 |
2.7%
|
|
| 55 | 1 |
0.9%
|
|
| 59 | 1 |
0.9%
|
|
| Sysmiss | 390 |