| Value |
Category |
| 1 |
Month and year reported |
| 2 |
Month and age reported, year imputed |
| 3 |
Year and age reported, month imputed |
| 5 |
Year reported, age and month imputed |
| 6 |
Age reported, year and month imputed |
| 8 |
Month reported, age and year imputed |
| 9 |
Year and age reported, year ignored |
| 10 |
Season and year reported |
| 11 |
All values imputed |
| 12 |
All reported, inconsistent |
| 99 |
NIU (not in universe) |
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.