| Value |
Category |
| 1 |
15 minutes or less |
| 2 |
16 Ð 30 Minutes |
| 3 |
31 Ð 60 Minutes |
| 4 |
More than an Hour |
| 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.