d STB-41 sg75. Geometric means and confidence intervals. d STB insert by d John Carlin, d Royal Children's Hospital and University of Melbourne, d Melbourne, Australia; d Suzanna Vidmar, d Royal Children's Hospital and University of Melbourne, d Melbourne, Australia; d Carlos Ramalheira, d Coimbra University Hospital, d Coimbra, Portugal. d Support: carlin@@cryptic.rch.unimelb.edu.au, d vidmars@@cryptic.rch.unimelb.edu.au, and d cramal@@cygnus.ci.uc.pt d After installation, see help ^gmci^. f sg75/gmci.ado f sg75/gmci.hlp f sg75/eg_gmci.dta