| Value |
Category |
| 01 |
Month and year reported |
| 02 |
Month and age reported, year imputed |
| 03 |
Year and age reported, month imputed |
| 05 |
Year reported, age and month imputed |
| 06 |
Age reported, year and month imputed |
| 08 |
Month reported, age and year imputed |
| 09 |
Year and age reported, year ignored |
| 10 |
Season and year reported |
| 11 |
All values imputed |
| 99 |
NIU (not in universe) |
| 12 |
All reported, inconsistent |
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.