| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 36 |
5.4%
|
| -7 | Does not apply | 1 |
0.2%
|
| 1 | One year or less | 81 |
12.2%
|
| 2 | 103 |
15.5%
|
|
| 3 | 87 |
13.1%
|
|
| 4 | 49 |
7.4%
|
|
| 5 | 54 |
8.1%
|
|
| 6 | 4 |
0.6%
|
|
| 7 | 102 |
15.4%
|
|
| 8 | 10 |
1.5%
|
|
| 10 | 33 |
5%
|
|
| 12 | 3 |
0.5%
|
|
| 13 | 1 |
0.2%
|
|
| 14 | 1 |
0.2%
|
|
| 15 | 30 |
4.5%
|
|
| 17 | 1 |
0.2%
|
|
| 20 | 10 |
1.5%
|
|
| 21 | 2 |
0.3%
|
|
| 24 | 1 |
0.2%
|
|
| 25 | 3 |
0.5%
|
|
| 30 | 28 |
4.2%
|
|
| 40 | 2 |
0.3%
|
|
| 45 | 9 |
1.4%
|
|
| 48 | 2 |
0.3%
|
|
| 50 | 1 |
0.2%
|
|
| 60 | 8 |
1.2%
|
|
| 70 | 1 |
0.2%
|
|
| 90 | 1 |
0.2%
|
|
| Sysmiss | 1971 |