| Value |
Category |
| 1 |
suddenly |
| 2 |
fast (within a day) |
| 3 |
slowly (over many days) |
| 8 |
don't know |
| 9 |
|
| 11 |
.Z |
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.