| Value |
Category |
| 1 |
none |
| 2 |
less than 1 hour |
| 3 |
1 - 2 hours |
| 4 |
3 - 4 hours |
| 5 |
more than 4 hours |
| 8 |
not admin. |
| 9 |
omitted |
| 11 |
.A |
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.