| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 109 |
35%
|
| 1 | One hour or less | 0 |
0%
|
| 2 | 1 |
0.3%
|
|
| 12 | 6 |
1.9%
|
|
| 15 | 2 |
0.6%
|
|
| 16 | 1 |
0.3%
|
|
| 20 | 5 |
1.6%
|
|
| 24 | 12 |
3.9%
|
|
| 30 | 25 |
8%
|
|
| 31 | 5 |
1.6%
|
|
| 33 | 1 |
0.3%
|
|
| 35 | 1 |
0.3%
|
|
| 36 | 4 |
1.3%
|
|
| 40 | 10 |
3.2%
|
|
| 45 | 1 |
0.3%
|
|
| 48 | 3 |
1%
|
|
| 50 | 4 |
1.3%
|
|
| 60 | 16 |
5.1%
|
|
| 70 | 3 |
1%
|
|
| 72 | 4 |
1.3%
|
|
| 80 | 4 |
1.3%
|
|
| 84 | 1 |
0.3%
|
|
| 90 | 4 |
1.3%
|
|
| 96 | 4 |
1.3%
|
|
| 100 | 10 |
3.2%
|
|
| 120 | 4 |
1.3%
|
|
| 150 | 3 |
1%
|
|
| 168 | 1 |
0.3%
|
|
| 172 | 1 |
0.3%
|
|
| 180 | 1 |
0.3%
|
|
| 192 | 5 |
1.6%
|
|
| 200 | 2 |
0.6%
|
|
| 240 | 4 |
1.3%
|
|
| 250 | 2 |
0.6%
|
|
| 288 | 2 |
0.6%
|
|
| 300 | 9 |
2.9%
|
|
| 350 | 1 |
0.3%
|
|
| 360 | 3 |
1%
|
|
| 400 | 4 |
1.3%
|
|
| 440 | 1 |
0.3%
|
|
| 450 | 1 |
0.3%
|
|
| 480 | 2 |
0.6%
|
|
| 500 | 6 |
1.9%
|
|
| 600 | 3 |
1%
|
|
| 700 | 1 |
0.3%
|
|
| 720 | 1 |
0.3%
|
|
| 740 | 1 |
0.3%
|
|
| 748 | 1 |
0.3%
|
|
| 750 | 2 |
0.6%
|
|
| 800 | 1 |
0.3%
|
|
| 900 | 1 |
0.3%
|
|
| 1000 | 2 |
0.6%
|
|
| 1200 | 2 |
0.6%
|
|
| 1400 | 1 |
0.3%
|
|
| 1440 | 1 |
0.3%
|
|
| 1450 | 1 |
0.3%
|
|
| 1500 | 2 |
0.6%
|
|
| 2000 | 1 |
0.3%
|
|
| 2800 | 1 |
0.3%
|
|
| 3600 | 1 |
0.3%
|
|
| Sysmiss | 281 |