In message <[log in to unmask]>, Andrew Jull <[log in to unmask]> writes >Dear all > >anybody got any ideas about how to manage LR+ and LR- where the sensitivity >and specificity are 100%? > Well they calculate out as infinity or 1/infinity don't they? Toby -- Toby Lipman General practitioner, Newcastle upon Tyne Northern and Yorkshire research training fellow Tel 0191-2811060 (home), 0191-2437000 (surgery) %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%