Raphael, I suggest you explore ANOVA. John John Sorkin M.D., Ph.D. Chief, Biostatistics and Informatics Baltimore VA Medical Center GRECC and University of Maryland School of Medicine Claude Pepper OAIC University of Maryland School of Medicine Division of Gerontology Baltimore VA Medical Center 10 North Greene Street GRECC (BT/18/GR) Baltimore, MD 21201-1524 410-605-7119 NOTE NEW EMAIL ADDRESS: [log in to unmask] >>> Raphael Fraser <[log in to unmask]> 9/25/2005 10:08:26 PM >>> Dear All, What statistical methods are presently available to compare more than two means? Thank you all! Raphael