| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 10 |
4%
|
| 1 | One hour or less | 0 |
0%
|
| 15 | 1 |
0.4%
|
|
| 20 | 1 |
0.4%
|
|
| 24 | 1 |
0.4%
|
|
| 30 | 42 |
17%
|
|
| 32 | 8 |
3.2%
|
|
| 35 | 28 |
11.3%
|
|
| 36 | 5 |
2%
|
|
| 38 | 3 |
1.2%
|
|
| 40 | 42 |
17%
|
|
| 42 | 8 |
3.2%
|
|
| 45 | 21 |
8.5%
|
|
| 48 | 14 |
5.7%
|
|
| 50 | 4 |
1.6%
|
|
| 52 | 2 |
0.8%
|
|
| 55 | 1 |
0.4%
|
|
| 56 | 3 |
1.2%
|
|
| 58 | 1 |
0.4%
|
|
| 60 | 3 |
1.2%
|
|
| 64 | 1 |
0.4%
|
|
| 70 | 2 |
0.8%
|
|
| 80 | 2 |
0.8%
|
|
| 85 | 1 |
0.4%
|
|
| 90 | 3 |
1.2%
|
|
| 95 | 1 |
0.4%
|
|
| 96 | 4 |
1.6%
|
|
| 120 | 2 |
0.8%
|
|
| 150 | 1 |
0.4%
|
|
| 192 | 4 |
1.6%
|
|
| 200 | 3 |
1.2%
|
|
| 216 | 1 |
0.4%
|
|
| 225 | 1 |
0.4%
|
|
| 250 | 3 |
1.2%
|
|
| 380 | 1 |
0.4%
|
|
| 480 | 1 |
0.4%
|
|
| 520 | 1 |
0.4%
|
|
| 562 | 1 |
0.4%
|
|
| 576 | 1 |
0.4%
|
|
| 624 | 1 |
0.4%
|
|
| 820 | 1 |
0.4%
|
|
| 850 | 1 |
0.4%
|
|
| 864 | 1 |
0.4%
|
|
| 870 | 1 |
0.4%
|
|
| 872 | 1 |
0.4%
|
|
| 900 | 1 |
0.4%
|
|
| 950 | 1 |
0.4%
|
|
| 972 | 3 |
1.2%
|
|
| 980 | 3 |
1.2%
|
|
| 985 | 1 |
0.4%
|
|
| Sysmiss | 272 |