| Value | Category | Cases | |
|---|---|---|---|
| 0 | Never | 165 |
10.1%
|
| 1 | Once or twice | 191 |
11.7%
|
| 2 | Three times or more | 39 |
2.4%
|
| Sysmiss | 1230 |
75.6%
|
|
| r | 1 |
0.1%
|