| Value | Category | Cases | |
|---|---|---|---|
| 0 | 1 |
0%
|
|
| 1 | Once | 2295 |
46.1%
|
| 2 | Twice | 631 |
12.7%
|
| 3 | Three times | 158 |
3.2%
|
| 4 | More than three times | 275 |
5.5%
|
| 5 | 1 |
0%
|
|
| 7 | N/a | 1615 |
32.5%
|
| Sysmiss | 18262 |