| Value | Category | Cases | |
|---|---|---|---|
| 1 | Very common | 509 |
23.2%
|
| 2 | Fairly common | 470 |
21.4%
|
| 3 | Fairly rare | 442 |
20.1%
|
| 4 | Very rare | 341 |
15.5%
|
| 9 | Don't know | 436 |
19.8%
|