| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 16 |
10.5%
|
| 1 | One hour or less | 1 |
0.7%
|
| 2 | 3 |
2%
|
|
| 3 | 1 |
0.7%
|
|
| 4 | 2 |
1.3%
|
|
| 5 | 7 |
4.6%
|
|
| 8 | 3 |
2%
|
|
| 10 | 10 |
6.5%
|
|
| 12 | 2 |
1.3%
|
|
| 15 | 1 |
0.7%
|
|
| 18 | 1 |
0.7%
|
|
| 20 | 25 |
16.3%
|
|
| 24 | 2 |
1.3%
|
|
| 30 | 16 |
10.5%
|
|
| 35 | 1 |
0.7%
|
|
| 40 | 30 |
19.6%
|
|
| 48 | 1 |
0.7%
|
|
| 50 | 5 |
3.3%
|
|
| 55 | 1 |
0.7%
|
|
| 60 | 3 |
2%
|
|
| 70 | 2 |
1.3%
|
|
| 75 | 1 |
0.7%
|
|
| 80 | 4 |
2.6%
|
|
| 90 | 1 |
0.7%
|
|
| 100 | 7 |
4.6%
|
|
| 120 | 5 |
3.3%
|
|
| 125 | 1 |
0.7%
|
|
| 300 | 1 |
0.7%
|
|
| Sysmiss | 139 |