| Value | Category | Cases | |
|---|---|---|---|
| 1 | last seven days | 1637 |
27%
|
| 2 | during the past month | 1486 |
24.5%
|
| 3 | before one month to less than six months | 709 |
11.7%
|
| 4 | less than a year | 417 |
6.9%
|
| 5 | more than a year | 493 |
8.1%
|
| 6 | never | 1320 |
21.8%
|
| 13 | 1 |
0%
|
|
| Sysmiss | 46903 |