| Value |
Category |
| 1 |
Less than 10 minutes |
| 2 |
10 - 20 minutes |
| 3 |
21 - 30 minutes |
| 4 |
More than 30 minutes |
| 9 |
Missing value |
Warning: these figures indicate the number of cases found in the data file. They cannot be interpreted as summary statistics of the population of interest.