| Value | Category |
|---|---|
| -4 | Missing data |
| -3 | Refused to answer |
| -2 | Not applicable |
| -1 | Don't know |
| 1 | Less than 5 minutes walk |
| 2 | From 5 to less than 10 minutes walk |
| 3 | From 10 minutes to less than 20 minutes walk |
| 4 | From 20 minutes or to less than 30 minutes walk |
| 5 | More than 30 minutes walking |