| Value |
Category |
| 1 |
Less than 0.5 hr |
| 2 |
0.5 hr - less than 1.0 hr |
| 3 |
1.0 hr - less than 2.0 hrs |
| 4 |
2.0 hrs or more |
| 9 |
NS |
| 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.