| Value | Category | Cases | |
|---|---|---|---|
| 1 | Apex | 68 |
15.4%
|
| 2 | Mid zone | 163 |
37%
|
| 3 | Basal | 208 |
47.2%
|
| 4 | Widespread | 2 |
0.5%
|
| 8 | Unknown | 0 |
0%
|
| 9 | Missing | 25 | |
| Sysmiss | 2218 |