| Value |
Category |
| 1 |
None |
| 2 |
Less than 30' |
| 3 |
30' - 1 hr |
| 4 |
1-2 hrs |
| 5 |
2-3 hrs |
| 6 |
3-4 hrs |
| 7 |
>4 hrs |
| 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.