| Value | Category | Cases | |
|---|---|---|---|
| 0 | Zero | 40 |
90.9%
|
| 1 | Once | 3 |
6.8%
|
| 2 | Twice | 1 |
2.3%
|
| 3 | More than twice or blank | 0 |
0%
|
| 9 | Missing | 0 | |
| Sysmiss | 24 |