| Value | Category | Cases | |
|---|---|---|---|
| -9 | missing | 1 |
0.3%
|
| -8 | dont know | 0 |
0%
|
| -7 | na | 0 |
0%
|
| 0 | less than a month | 20 |
6.2%
|
| 1 | 1-5 months | 146 |
45.3%
|
| 2 | 6-12 months | 63 |
19.6%
|
| 3 | over 1 year | 92 |
28.6%
|
| Sysmiss | 1704 |