| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 0 |
0%
|
| 0 | 18 |
9%
|
|
| 1 | One minute or less | 32 |
15.9%
|
| 4 | 1 |
0.5%
|
|
| 5 | 1 |
0.5%
|
|
| 10 | 3 |
1.5%
|
|
| 15 | 20 |
10%
|
|
| 20 | 12 |
6%
|
|
| 25 | 9 |
4.5%
|
|
| 30 | 45 |
22.4%
|
|
| 35 | 6 |
3%
|
|
| 40 | 11 |
5.5%
|
|
| 45 | 18 |
9%
|
|
| 50 | 14 |
7%
|
|
| 55 | 5 |
2.5%
|
|
| 59 | 6 |
3%
|
|
| Sysmiss | 444 |