| Value | Category | Cases | |
|---|---|---|---|
| 1 | Days | 31 |
0.3%
|
| 2 | Months | 616 |
6.7%
|
| 3 | Weeks | 18 |
0.2%
|
| 4 | Years | 6808 |
74%
|
| 5 | Don't know | 1471 |
16%
|
| 6 | Not Applicable | 106 |
1.2%
|
| 7 | Refused | 60 |
0.7%
|
| 8 | Missing | 85 |
0.9%
|
| Sysmiss | 7054 |