| Value |
Category |
| 0 |
very irregularly |
| 1 |
less than 1 hour |
| 2 |
between 1 and 2 hours |
| 3 |
between 2 and 4 hours |
| 4 |
more than 4 hours |
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.