| Value | Category | Cases | |
|---|---|---|---|
| 1 | Very common | 119 |
5.4%
|
| 2 | Fairly common | 229 |
10.4%
|
| 3 | Fairly rare | 433 |
19.7%
|
| 4 | Very rare | 1277 |
58.1%
|
| 9 | Don't know | 140 |
6.4%
|