| Value | Category | Cases | |
|---|---|---|---|
| 0 | never | 84 |
79.2%
|
| 1 | 0-11 months ago | 1 |
0.9%
|
| 2 | 12+ months ago | 20 |
18.9%
|
| 3 | yes, but don't remember when | 1 |
0.9%
|
| 4 | yes, but frequency in last 12 months missing | 0 |
0%
|
| Sysmiss | 2911 |