| Value | Category | Cases | |
|---|---|---|---|
| 1 | a.30 minutes or less | 4 |
0.1%
|
| 2 | b.more than 30 minutes but less than one hours | 1 |
0%
|
| 3 | c.more than one hour | 1 |
0%
|
| Missing value | 3540 |
99.8%
|