| Value | Category | Cases | |
|---|---|---|---|
| 1 | a.30 minutes or less | 8 |
0%
|
| 2 | b.more than 30 minutes but less than one hours | 13 |
0.1%
|
| 3 | c.more than one hour | 12 |
0.1%
|
| 4 | d.Don’t know | 94 |
0.4%
|
| Missing value | 23827 |
99.5%
|