| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 0 |
0%
|
| 1 | One year or less | 1 |
0.5%
|
| 2 | 2 |
1%
|
|
| 3 | 1 |
0.5%
|
|
| 5 | 12 |
5.7%
|
|
| 6 | 5 |
2.4%
|
|
| 7 | 7 |
3.3%
|
|
| 8 | 13 |
6.2%
|
|
| 9 | 5 |
2.4%
|
|
| 10 | 24 |
11.5%
|
|
| 11 | 4 |
1.9%
|
|
| 12 | 3 |
1.4%
|
|
| 13 | 5 |
2.4%
|
|
| 14 | 3 |
1.4%
|
|
| 15 | 19 |
9.1%
|
|
| 16 | 2 |
1%
|
|
| 17 | 3 |
1.4%
|
|
| 18 | 6 |
2.9%
|
|
| 19 | 2 |
1%
|
|
| 20 | 24 |
11.5%
|
|
| 21 | 6 |
2.9%
|
|
| 22 | 7 |
3.3%
|
|
| 23 | 2 |
1%
|
|
| 24 | 2 |
1%
|
|
| 25 | 6 |
2.9%
|
|
| 26 | 3 |
1.4%
|
|
| 27 | 2 |
1%
|
|
| 28 | 1 |
0.5%
|
|
| 29 | 2 |
1%
|
|
| 30 | 11 |
5.3%
|
|
| 31 | 2 |
1%
|
|
| 32 | 3 |
1.4%
|
|
| 33 | 6 |
2.9%
|
|
| 35 | 4 |
1.9%
|
|
| 36 | 3 |
1.4%
|
|
| 37 | 1 |
0.5%
|
|
| 39 | 1 |
0.5%
|
|
| 40 | 2 |
1%
|
|
| 42 | 1 |
0.5%
|
|
| 43 | 1 |
0.5%
|
|
| 45 | 1 |
0.5%
|
|
| 48 | 1 |
0.5%
|