| Value | Category | Cases | |
|---|---|---|---|
| 0 | 1 |
0.1%
|
|
| 1 | Once | 1287 |
97.9%
|
| 2 | Twice | 23 |
1.7%
|
| 3 | Three ti | 3 |
0.2%
|
| 5 | 1 |
0.1%
|
|
| Sysmiss | 359 |