| Value | Category | Cases | |
|---|---|---|---|
| 1 | Very common | 407 |
18.5%
|
| 2 | Fairly common | 468 |
21.3%
|
| 3 | Fairly rare | 397 |
18.1%
|
| 4 | Very rare | 395 |
18%
|
| 9 | Don't know | 531 |
24.2%
|