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Listers, In a regression analysis, with results as below: variable B-value P-Value Gravida (1) Gravida (0) Risk month (1) Risk month (0) Gravida * Risk month -51.0 0.02 what does the -51.0 mean?. I have left out B and P-values for the other variables. The model estimates birth-weight. Gravida is either multigravidae or primigravidae and the risk month refers to being born in months with higher risk of malaria or lower risk of malaria. Cathy _________________________________________________________________ Is your PC infected? Get a FREE online computer virus scan from McAfeeŽ Security. http://clinic.mcafee.com/clinic/ibuy/campaign.asp?cid=3963