Creating a scale that starts with “0” is a little bit tricky. As with most other EFS question types, the slider’s code “0” is a system missing value reserved for seen but not answered questions. Therefore, the creation of an answer option encoded “0” is not possible.
To bypass this issue, create an answer option which may have any code unequal “0” (e.g. code = “101” in a scale from “0” to “100”) and the number “1”, but is labelled “0”. Please mind that if you use such a scale, the display of the scale values in a box on the right hand must be deactivated: The box contains the code, which might cause misunderstandings in this special case.