Fig. 5. Linear mixed effects (LME) model predicted oocyst attenuation, _eff20 (dimensionless), as a function of macropore water content, _o (cm³ cm^–3), and macropore hydraulic conductivity, K_o (cm d^–1). Higher K_o leads to less attenuation (top). Predicted values are compared with measured values (bottom), yielding a SE of 0.32. Further statistical evaluation of the LME model is given in Table 5.