Standard deviation to count

Thank you, but the point is that my impulsivity index does not have a fixed scale, e.g. from 1 to 5, but it is changeable and its distribution is different depending on the sample of respondents. That is, the maximum result on the impulsivity index can be 5 in one sample but 2 in another. That means that the maximum result depends on the test sample. I do not know if I expressed myself well.