| Valeur | Catégorie | le cas | |
|---|---|---|---|
| 0 | never | 599 |
96.1%
|
| 1 | 0-11 months ago | 4 |
0.6%
|
| 2 | 12+ months ago | 10 |
1.6%
|
| 3 | yes, but don't remember when | 10 |
1.6%
|
| 4 | yes, but frequency in last 12 months missing | 0 |
0%
|
| Sysmiss | 15091 |