| Value | Category | Cases | |
|---|---|---|---|
| 0 | Never | 154 |
9.5%
|
| 1 | Once or twice | 206 |
12.7%
|
| 2 | Three times or more | 34 |
2.1%
|
| Sysmiss | 1230 |
75.6%
|
|
| r | 2 |
0.1%
|