For way too much information on the difference between odds ratio and relative risk, go here: http://www.childrens-mercy.org/stats/journal/oddsratio.asp For greater sanity, don't. : ) linda *********************************************** Archives: http://community.lsoft.com/archives/LACTNET.html Mail all commands to [log in to unmask] To temporarily stop your subscription: set lactnet nomail To start it again: set lactnet mail (or [log in to unmask]) To unsubscribe: unsubscribe lactnet or ([log in to unmask]) To reach list owners: [log in to unmask]