| Valeur | Catégorie | le cas | |
|---|---|---|---|
| 0 | Never | 3605 |
51.1%
|
| 1 | Once or twice | 2006 |
28.4%
|
| 2 | More often | 1449 |
20.5%
|
| 9 | 29 | ||
| Sysmiss | 824 |