| Value | Category | Cases | |
|---|---|---|---|
| 0 | Zero | 20 |
24.1%
|
| 1 | Once | 27 |
32.5%
|
| 2 | Twice | 12 |
14.5%
|
| 3 | More than twice or blank | 24 |
28.9%
|
| 9 | Missing | 0 |