Hello everyone. I am working with a data-set of a cohort study which has 3 different sets of paired data. For the third visit of the subjects, we have a lot of missing. So, I need to compare the basic characteristics (in the first and second visit) of the missing and non-missing subjects for my outcome in the third visit. How can I do that in spss? For example, I want to have the mean difference between missing and non-missing subjects for my dependent variable for the variable "age".Thanks in advance.