| Value |
Category |
| 1 |
less than 9 hours |
| 2 |
9-15 hours |
| 3 |
16-20 hours |
| 4 |
21-30 hours |
| 5 |
31-40 hours |
| 6 |
41-50 hours |
| 7 |
51 hours and more |
| 8 |
temporarily absent |
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.