| Value | Category | Cases | |
|---|---|---|---|
| 0 | Less than 1 month | 19 |
3%
|
| 1 | 1- | 170 |
26.9%
|
| 2 | 2- | 144 |
22.8%
|
| 3 | 3- | 158 |
25%
|
| 4 | 4- | 109 |
17.3%
|
| 5 | 6- | 20 |
3.2%
|
| 99 | Not specified | 11 |
1.7%
|
| Sysmiss | 965 |