| Value | Category | Cases | |
|---|---|---|---|
| 1 | First quartile | 8562 |
25.5%
|
| 2 | Second quartile | 8343 |
24.9%
|
| 3 | Third quartile | 6678 |
19.9%
|
| 4 | Fourth quartile | 6002 |
17.9%
|
| 5 | Don't know | 3507 |
10.5%
|
| 6 | Refused | 421 |
1.3%
|
| Sysmiss | 706 |