| Value | Category | Cases | |
|---|---|---|---|
| 1 | none | 503 |
24.4%
|
| 2 | once | 144 |
7%
|
| 3 | twice | 96 |
4.7%
|
| 4 | three or more | 59 |
2.9%
|
| 5 | does not apply | 1259 |
61.1%
|
| Sysmiss | 14369 |