| Value | Category | Cases | |
|---|---|---|---|
| 0 | none | 2997 |
20.1%
|
| 1 | primary inc (< 7) | 4227 |
28.3%
|
| 2 | primary complete (7) | 1846 |
12.4%
|
| 3 | secy incomplete (8-11) | 4548 |
30.4%
|
| 4 | secy complete (12)/higher | 1328 |
8.9%
|