| Value | Category | Cases | |
|---|---|---|---|
| 1 | Nothing. | 1009 |
19.3%
|
| 2 | Less than 10 | 311 |
6%
|
| 3 | 10 to 20 eek | 754 |
14.5%
|
| 4 | 20 to 30 eek | 674 |
12.9%
|
| 5 | 30 to 40 eek | 456 |
8.7%
|
| 6 | 40 to 50 eek | 515 |
9.9%
|
| 7 | 50 to 60 eek | 386 |
7.4%
|
| 8 | 60 eek or more | 1111 |
21.3%
|
| Sysmiss | 128 |