A variety of characteristics are listed here. Could you take a look at them and select those which apply to you?
Categories
Value
Category
-5
Missing; Unknown; Inappropiate
-4
Not asked
-3
Not applicable
-2
No answer
-1
Don´t know
1
Mention
2
No
Sysmiss
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.