| Value | Category | Cases | |
|---|---|---|---|
| 0 | None | 7 |
0.1%
|
| 1 | Grade 1 | 153 |
2.2%
|
| 2 | Grade 2 | 542 |
7.7%
|
| 3 | Grade 3 | 834 |
11.9%
|
| 4 | Grade 4 | 734 |
10.5%
|
| 5 | Grade 5 | 1155 |
16.5%
|
| 6 | Grade 6 | 331 |
4.7%
|
| 7 | Grade 7 | 236 |
3.4%
|
| 8 | Grade 8 | 164 |
2.3%
|
| 9 | Grade 9 | 790 |
11.3%
|
| 10 | Grade 10 | 94 |
1.3%
|
| 11 | Grade 11 | 33 |
0.5%
|
| 12 | Grade 12 | 441 |
6.3%
|
| 13 | Don't know | 1496 |
21.3%
|
| Sysmiss | 16829 |