| Value | Category | Cases | |
|---|---|---|---|
| 1 | Very high quality | 390 |
12.2%
|
| 2 | Good quality | 884 |
27.7%
|
| 3 | Acceptable quality | 827 |
25.9%
|
| 4 | Poor quality | 164 |
5.1%
|
| 5 | Very poor quality | 284 |
8.9%
|
| 8 | Uncertain or Don't know | 645 |
20.2%
|
| Sysmiss | 127 |