| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 2 |
0.8%
|
| 1 | One hour or less | 57 |
24.2%
|
| 2 | 33 |
14%
|
|
| 3 | 33 |
14%
|
|
| 4 | 17 |
7.2%
|
|
| 5 | 25 |
10.6%
|
|
| 6 | 10 |
4.2%
|
|
| 7 | 1 |
0.4%
|
|
| 8 | 10 |
4.2%
|
|
| 9 | 1 |
0.4%
|
|
| 11 | 1 |
0.4%
|
|
| 12 | 8 |
3.4%
|
|
| 14 | 1 |
0.4%
|
|
| 15 | 2 |
0.8%
|
|
| 18 | 1 |
0.4%
|
|
| 20 | 1 |
0.4%
|
|
| 24 | 20 |
8.5%
|
|
| 30 | 2 |
0.8%
|
|
| 45 | 1 |
0.4%
|
|
| 48 | 6 |
2.5%
|
|
| 59 | 2 |
0.8%
|
|
| 72 | 2 |
0.8%
|
|
| Sysmiss | 789 |