| Value | Category |
|---|---|
| -9 | Missing |
| -8 | Don't know |
| -7 | Notappl |
| 1 | Less than one day |
| 2 | Between one day and one week |
| 3 | Between one and two weeks |
| 4 | Between two weeks and a month |
| 5 | Within one and three months |
| 6 | Between three months and six months |
| 7 | Between six months and one year |
| Sysmiss |