Value | Category |
---|---|
-5 | other |
-4 | missing data |
-3 | refused to answer |
-2 | not applicable |
-1 | do not know |
0 | indefinite |
1 | january |
2 | february |
3 | march |
4 | april |
5 | may |
6 | june |
7 | july |
8 | august |
9 | september |
10 | october |
11 | november |
12 | december |