| Value | Category | Cases | |
|---|---|---|---|
| 1 | once | 3276 |
42.8%
|
| 2 | twice | 1039 |
13.6%
|
| 3 | three or more | 643 |
8.4%
|
| 4 | does not apply | 458 |
6%
|
| 5 | none | 2231 |
29.2%
|
| Sysmiss | 41539 |