| Value | Category | Cases | |
|---|---|---|---|
| 0 | Zero | 37 |
57.8%
|
| 1 | Once | 23 |
35.9%
|
| 2 | Twice | 3 |
4.7%
|
| 3 | More than twice or blank | 1 |
1.6%
|
| 9 | Missing | 0 | |
| Sysmiss | 105 |