| Value | Category | Cases | |
|---|---|---|---|
| 0 | never | 150 |
78.9%
|
| 1 | 0-11 months ago | 0 |
0%
|
| 2 | 12+ months ago | 37 |
19.5%
|
| 3 | yes, but don't remember when | 3 |
1.6%
|
| 4 | yes, but frequency in last 12 months missing | 0 |
0%
|
| Sysmiss | 6323 |