| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 16 |
4.4%
|
| 1 | One hour or less | 113 |
31.1%
|
| 2 | 26 |
7.2%
|
|
| 3 | 13 |
3.6%
|
|
| 4 | 12 |
3.3%
|
|
| 5 | 4 |
1.1%
|
|
| 6 | 6 |
1.7%
|
|
| 7 | 2 |
0.6%
|
|
| 8 | 14 |
3.9%
|
|
| 9 | 1 |
0.3%
|
|
| 10 | 4 |
1.1%
|
|
| 12 | 11 |
3%
|
|
| 14 | 1 |
0.3%
|
|
| 15 | 2 |
0.6%
|
|
| 16 | 5 |
1.4%
|
|
| 20 | 1 |
0.3%
|
|
| 24 | 22 |
6.1%
|
|
| 28 | 4 |
1.1%
|
|
| 30 | 13 |
3.6%
|
|
| 32 | 3 |
0.8%
|
|
| 36 | 7 |
1.9%
|
|
| 40 | 15 |
4.1%
|
|
| 42 | 2 |
0.6%
|
|
| 44 | 1 |
0.3%
|
|
| 48 | 10 |
2.8%
|
|
| 54 | 1 |
0.3%
|
|
| 56 | 8 |
2.2%
|
|
| 60 | 6 |
1.7%
|
|
| 72 | 4 |
1.1%
|
|
| 75 | 1 |
0.3%
|
|
| 80 | 3 |
0.8%
|
|
| 96 | 2 |
0.6%
|
|
| 112 | 2 |
0.6%
|
|
| 120 | 7 |
1.9%
|
|
| 160 | 2 |
0.6%
|
|
| 168 | 1 |
0.3%
|
|
| 176 | 2 |
0.6%
|
|
| 180 | 1 |
0.3%
|
|
| 208 | 1 |
0.3%
|
|
| 240 | 8 |
2.2%
|
|
| 288 | 1 |
0.3%
|
|
| 400 | 1 |
0.3%
|
|
| 416 | 1 |
0.3%
|
|
| 480 | 1 |
0.3%
|
|
| 576 | 1 |
0.3%
|
|
| 720 | 1 |
0.3%
|