| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 2 |
0.5%
|
| 0 | 223 |
57.3%
|
|
| 1 | One minute or less | 45 |
11.6%
|
| 2 | 2 |
0.5%
|
|
| 5 | 8 |
2.1%
|
|
| 7 | 3 |
0.8%
|
|
| 10 | 8 |
2.1%
|
|
| 15 | 5 |
1.3%
|
|
| 18 | 1 |
0.3%
|
|
| 20 | 7 |
1.8%
|
|
| 22 | 1 |
0.3%
|
|
| 25 | 2 |
0.5%
|
|
| 30 | 64 |
16.5%
|
|
| 35 | 1 |
0.3%
|
|
| 40 | 5 |
1.3%
|
|
| 45 | 6 |
1.5%
|
|
| 50 | 2 |
0.5%
|
|
| 59 | 4 |
1%
|
|
| Sysmiss | 233 |