I am wondering if I can ask a bit of help.

I have patients undergoing two different procedures (binary factor). One of the outcomes is is a continuous variable (range from 0 to 2, but heavily skewed to the right). I am only interested comparing the variability between the two groups, not the means.

What is the best test to use for comparing the variability between the two groups? Is Levene's test for homogeneity appropriate? Or is there something else more "standard" in the literature?

I am using SPSS.

Many thanks in advance for any help.

Joe