Dendrite diagram for variable cluster analysis (VCA) of in vivo predictor variables used in mixed models for cell membrane properties, showing that three clusters of variables explain more than 70 percent of the total variance: lifetime ethanol intake (LEI), average blood ethanol concentration (BEC), age at necropsy (Age), cortisol (CORT), adrenocorticotropic hormone (ACTH), deoxycortisol (DOC), aldosterone (ALD), testosterone (T) and dehydroepiandrosterone sulfate (DHEAS)