I am conducting a Latent Transition Analysis (LTA) in Mplus and using a covariate to examine the interaction of the covariate on the transition patterns. My sample is a clinical sample, and I am examining transitions over the course of treatment. My covariates represent categories with low base-rates (i.e. males who report past sexual abuse). What I am finding, is that when the covariate is included in my model, certain transition paths (ie c1#2 to c2#3) are estimated to have 0 probabilities. This is of substantive interest and makes sense theoretically. However, statistically, this zero estimate causes one of my estimated odds ratios to be very large (i.e. 57725). Is this accurate? How can I report this in my write-up?