| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 108 |
28.8%
|
| 1 | One hour or less | 62 |
16.5%
|
| 2 | 11 |
2.9%
|
|
| 3 | 8 |
2.1%
|
|
| 4 | 3 |
0.8%
|
|
| 5 | 6 |
1.6%
|
|
| 6 | 3 |
0.8%
|
|
| 8 | 1 |
0.3%
|
|
| 10 | 3 |
0.8%
|
|
| 12 | 9 |
2.4%
|
|
| 14 | 1 |
0.3%
|
|
| 20 | 7 |
1.9%
|
|
| 24 | 17 |
4.5%
|
|
| 30 | 20 |
5.3%
|
|
| 35 | 4 |
1.1%
|
|
| 36 | 10 |
2.7%
|
|
| 40 | 4 |
1.1%
|
|
| 48 | 11 |
2.9%
|
|
| 50 | 4 |
1.1%
|
|
| 60 | 12 |
3.2%
|
|
| 70 | 1 |
0.3%
|
|
| 72 | 2 |
0.5%
|
|
| 96 | 3 |
0.8%
|
|
| 110 | 1 |
0.3%
|
|
| 120 | 4 |
1.1%
|
|
| 160 | 1 |
0.3%
|
|
| 168 | 1 |
0.3%
|
|
| 180 | 1 |
0.3%
|
|
| 192 | 2 |
0.5%
|
|
| 200 | 1 |
0.3%
|
|
| 240 | 1 |
0.3%
|
|
| 250 | 1 |
0.3%
|
|
| 288 | 9 |
2.4%
|
|
| 300 | 2 |
0.5%
|
|
| 320 | 1 |
0.3%
|
|
| 360 | 4 |
1.1%
|
|
| 384 | 1 |
0.3%
|
|
| 408 | 1 |
0.3%
|
|
| 480 | 4 |
1.1%
|
|
| 500 | 2 |
0.5%
|
|
| 504 | 1 |
0.3%
|
|
| 540 | 1 |
0.3%
|
|
| 550 | 1 |
0.3%
|
|
| 576 | 1 |
0.3%
|
|
| 600 | 2 |
0.5%
|
|
| 700 | 1 |
0.3%
|
|
| 720 | 4 |
1.1%
|
|
| 750 | 2 |
0.5%
|
|
| 768 | 1 |
0.3%
|
|
| 840 | 1 |
0.3%
|
|
| 900 | 1 |
0.3%
|
|
| 960 | 1 |
0.3%
|
|
| 1000 | 1 |
0.3%
|
|
| 1200 | 1 |
0.3%
|
|
| 1440 | 1 |
0.3%
|
|
| 1500 | 4 |
1.1%
|
|
| 1800 | 1 |
0.3%
|
|
| 1830 | 1 |
0.3%
|
|
| 2400 | 1 |
0.3%
|
|
| 7200 | 1 |
0.3%
|