| Value | Category | Cases | |
|---|---|---|---|
| 1 | Very common | 624 |
28.4%
|
| 2 | Fairly common | 528 |
24%
|
| 3 | Fairly rare | 328 |
14.9%
|
| 4 | Very rare | 288 |
13.1%
|
| 9 | Don't know | 430 |
19.6%
|