| Value | Category | Cases | |
|---|---|---|---|
| 1 | First quartile | 393 |
19.6%
|
| 2 | Second quartile | 390 |
19.4%
|
| 3 | Third quartile | 611 |
30.4%
|
| 4 | Fourth quartile | 470 |
23.4%
|
| 5 | Don't know | 137 |
6.8%
|
| 6 | Refused | 8 |
0.4%
|