| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 8 |
5.2%
|
| 1 | One hour or less | 1 |
0.6%
|
| 2 | 2 |
1.3%
|
|
| 3 | 2 |
1.3%
|
|
| 4 | 1 |
0.6%
|
|
| 6 | 3 |
1.9%
|
|
| 7 | 1 |
0.6%
|
|
| 10 | 2 |
1.3%
|
|
| 12 | 2 |
1.3%
|
|
| 15 | 1 |
0.6%
|
|
| 20 | 1 |
0.6%
|
|
| 24 | 16 |
10.3%
|
|
| 28 | 1 |
0.6%
|
|
| 29 | 1 |
0.6%
|
|
| 30 | 4 |
2.6%
|
|
| 34 | 4 |
2.6%
|
|
| 36 | 3 |
1.9%
|
|
| 40 | 1 |
0.6%
|
|
| 42 | 7 |
4.5%
|
|
| 48 | 60 |
38.7%
|
|
| 72 | 33 |
21.3%
|
|
| 112 | 1 |
0.6%
|