| Valeur | Catégorie | le cas | |
|---|---|---|---|
| 0 | No | 550 |
93.5%
|
| 1 | Yes, once | 11 |
1.9%
|
| 2 | Yes, more than once | 27 |
4.6%
|
| 9 | 6 | ||
| Sysmiss | 280 |