| Value | Category | Cases | |
|---|---|---|---|
| 1 | Very common | 470 |
21.4%
|
| 2 | Fairly common | 593 |
27%
|
| 3 | Fairly rare | 467 |
21.2%
|
| 4 | Very rare | 369 |
16.8%
|
| 9 | Don't know | 299 |
13.6%
|