Value | Category |
---|---|
00 | Less than 1 month old |
01 | 1 month old |
02 | 2 months old |
03 | 3 months old |
04 | 4 months old |
05 | 5 months old |
06 | 6 months old |
07 | 7 months old |
08 | 8 months old |
09 | 9 months old |
10 | 10 months old |
11 | 11 months old |
98 | Unknown |
99 | NIU (1 year and older) |