| Value | Category |
|---|---|
| -4 | Missing data |
| -3 | Refused to answer |
| -2 | Not applicable |
| -1 | Don't know |
| 1 | Less than 15 minutes |
| 2 | between 15 minutes and 30 minutes |
| 3 | more than 30 minutes but less than 1 hour |
| 4 | 1 hour to less than 1.5 hours |
| 5 | 1.5 to less than 2 hours |
| 6 | 2 hours or more |