| Value |
Category |
| 1 |
Less than 30 minutes |
| 2 |
At least 30 minutes, but less than 60 minutes |
| 3 |
At least 1 hour, but less than 2 hours |
| 4 |
2 hours or more |
| Sysmiss |
|
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.