| Value |
Category |
| 0 |
not yet occurred |
| 1 |
exact |
| 2 |
+/-1 year |
| 3 |
within 5 years |
| 4 |
within 10 years |
| 5 |
wild guess |
| 9 |
not ascertained |
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.