| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 18 |
11.8%
|
| 1 | One hour or less | 6 |
3.9%
|
| 2 | 1 |
0.7%
|
|
| 3 | 1 |
0.7%
|
|
| 4 | 1 |
0.7%
|
|
| 6 | 1 |
0.7%
|
|
| 7 | 2 |
1.3%
|
|
| 8 | 1 |
0.7%
|
|
| 14 | 2 |
1.3%
|
|
| 15 | 1 |
0.7%
|
|
| 16 | 7 |
4.6%
|
|
| 18 | 1 |
0.7%
|
|
| 20 | 5 |
3.3%
|
|
| 21 | 5 |
3.3%
|
|
| 24 | 7 |
4.6%
|
|
| 28 | 2 |
1.3%
|
|
| 30 | 5 |
3.3%
|
|
| 32 | 3 |
2%
|
|
| 35 | 2 |
1.3%
|
|
| 36 | 2 |
1.3%
|
|
| 40 | 1 |
0.7%
|
|
| 42 | 1 |
0.7%
|
|
| 48 | 2 |
1.3%
|
|
| 50 | 1 |
0.7%
|
|
| 56 | 1 |
0.7%
|
|
| 60 | 1 |
0.7%
|
|
| 72 | 2 |
1.3%
|
|
| 80 | 1 |
0.7%
|
|
| 90 | 1 |
0.7%
|
|
| 96 | 5 |
3.3%
|
|
| 128 | 1 |
0.7%
|
|
| 130 | 1 |
0.7%
|
|
| 160 | 2 |
1.3%
|
|
| 192 | 1 |
0.7%
|
|
| 200 | 3 |
2%
|
|
| 250 | 1 |
0.7%
|
|
| 288 | 1 |
0.7%
|
|
| 300 | 1 |
0.7%
|
|
| 320 | 1 |
0.7%
|
|
| 360 | 1 |
0.7%
|
|
| 384 | 2 |
1.3%
|
|
| 416 | 2 |
1.3%
|
|
| 432 | 1 |
0.7%
|
|
| 480 | 6 |
3.9%
|
|
| 500 | 2 |
1.3%
|
|
| 528 | 1 |
0.7%
|
|
| 624 | 1 |
0.7%
|
|
| 672 | 1 |
0.7%
|
|
| 780 | 1 |
0.7%
|
|
| 850 | 2 |
1.3%
|
|
| 900 | 1 |
0.7%
|
|
| 920 | 1 |
0.7%
|
|
| 960 | 9 |
5.9%
|
|
| 1000 | 2 |
1.3%
|
|
| 1150 | 1 |
0.7%
|
|
| 1190 | 1 |
0.7%
|
|
| 1200 | 1 |
0.7%
|
|
| 1440 | 1 |
0.7%
|
|
| 1920 | 13 |
8.6%
|
|
| 2000 | 1 |
0.7%
|