| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 2 |
1.5%
|
| 0 | Less than 1 hour | 38 |
27.9%
|
| 1 | 20 |
14.7%
|
|
| 2 | 25 |
18.4%
|
|
| 3 | 15 |
11%
|
|
| 4 | 7 |
5.1%
|
|
| 5 | 6 |
4.4%
|
|
| 6 | 1 |
0.7%
|
|
| 8 | 2 |
1.5%
|
|
| 10 | 3 |
2.2%
|
|
| 12 | 2 |
1.5%
|
|
| 15 | 2 |
1.5%
|
|
| 18 | 1 |
0.7%
|
|
| 20 | 1 |
0.7%
|
|
| 24 | 2 |
1.5%
|
|
| 30 | 1 |
0.7%
|
|
| 48 | 3 |
2.2%
|
|
| 72 | 3 |
2.2%
|
|
| 73 | 1 |
0.7%
|
|
| 142 | 1 |
0.7%
|
|
| Sysmiss | 294 |