| Value | Category | Cases | |
|---|---|---|---|
| 1 | Less than one month | 13 |
10%
|
| 2 | 1 to 3 month | 26 |
20%
|
| 3 | 4 to 6 month | 20 |
15.4%
|
| 4 | 7 to 12 month | 13 |
10%
|
| 5 | 13 to 24 months | 18 |
13.8%
|
| 6 | More than 2 years | 40 |
30.8%
|
| Sysmiss | 27908 |