| value | category | cases | |
|---|---|---|---|
| 0 | Never | 25126 |
64.5%
|
| 1 | Once or twice | 8073 |
20.7%
|
| 2 | More often | 5767 |
14.8%
|
| 9 | 167 | ||
| Sysmiss | 2387 |