I am doing a retrospective chart review comparing old treatment regimen (120 shots of laser) to a new treatment regimen (160 shots of laser). The main outcome measured is intra-ocular pressure (i.e. dependent variable).
Therefore my independent variable is dichotomous, and my dependent variable is continuous.
The problem is that in the study, some patients have submitted 2 eyes into the study, where as some patients have only submitted 1 eye into the study. Therefore to do an independent sample t-test would not account for the fact that some patients have submitted 2 eyes into the study, and these 2 eyes are likely to be similar in nature as they are from the same person.
What statistical test could I use for this? And would I be able to account for other variables, e.g. age, gender etc.?
I am currently using STATA.