Data Analysis<BR>Data were subjected to nonlinear regression using log-logistic analysis to describe a dose-response relationship <BR>Seefeldt et al. 1995 <BR> <BR>C = Lower limit <BR>D = Upper limit <BR>b = slope <BR>I50= dose giving 50% response <BR> <BR>Parameter estimates were obtained using PROC GLM in SAS 9.4 and graphed in SigmaPlot 14.0<BR>