| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 4 |
1.5%
|
| 1 | One hour or less | 7 |
2.6%
|
| 3 | 14 |
5.1%
|
|
| 4 | 13 |
4.8%
|
|
| 5 | 7 |
2.6%
|
|
| 8 | 11 |
4%
|
|
| 10 | 6 |
2.2%
|
|
| 12 | 2 |
0.7%
|
|
| 15 | 3 |
1.1%
|
|
| 16 | 7 |
2.6%
|
|
| 18 | 6 |
2.2%
|
|
| 20 | 4 |
1.5%
|
|
| 24 | 1 |
0.4%
|
|
| 25 | 2 |
0.7%
|
|
| 30 | 56 |
20.6%
|
|
| 32 | 9 |
3.3%
|
|
| 35 | 24 |
8.8%
|
|
| 38 | 3 |
1.1%
|
|
| 40 | 23 |
8.5%
|
|
| 42 | 8 |
2.9%
|
|
| 45 | 22 |
8.1%
|
|
| 48 | 15 |
5.5%
|
|
| 50 | 3 |
1.1%
|
|
| 52 | 3 |
1.1%
|
|
| 54 | 2 |
0.7%
|
|
| 55 | 1 |
0.4%
|
|
| 56 | 1 |
0.4%
|
|
| 58 | 1 |
0.4%
|
|
| 60 | 3 |
1.1%
|
|
| 72 | 4 |
1.5%
|
|
| 75 | 1 |
0.4%
|
|
| 78 | 1 |
0.4%
|
|
| 80 | 2 |
0.7%
|
|
| 82 | 3 |
1.1%
|
|
| Sysmiss | 247 |