| Value | Category | Cases | |
|---|---|---|---|
| 1 | Less than 1/4 | 179 |
47.1%
|
| 2 | 1/4 | 69 |
18.2%
|
| 3 | 1/2 | 62 |
16.3%
|
| 4 | 3/4 | 18 |
4.7%
|
| 5 | The whole area of plot | 52 |
13.7%
|
| Sysmiss | 1559 |