| Value | Category | Cases | |
|---|---|---|---|
| 1 | Very high quality | 390 |
12.3%
|
| 2 | Good quality | 876 |
27.5%
|
| 3 | Acceptable quality | 763 |
24%
|
| 4 | Poor quality | 146 |
4.6%
|
| 5 | Very poor quality | 219 |
6.9%
|
| 8 | Uncertain or Don't know | 786 |
24.7%
|
| Sysmiss | 141 |