| Value | Category | Cases | |
|---|---|---|---|
| 1 | less than 1 month | 70 |
2.3%
|
| 2 | 1 month to < 6 months | 55 |
1.8%
|
| 3 | 6 months to < 12 months | 25 |
0.8%
|
| 4 | 1 year or more | 29 |
0.9%
|
| Missing value | 2876 |
94.1%
|