The 50 patients admitted from September 1, 2009, to September 1, 2010, were evaluated to derive the modified SOFA (SOFA-HM) score. The variable “days since most recent infection” was ini- tially treated as a continuous variable; this variable was assigned a value of 91 for patients who did not have an inpatient infection in the 90 days before ICU admission. To determine the nature of the rela- tionship between days since most recent infection and 30-day mortality independent of the SOFA score, we adjusted the value of days since most recent infection by dividing it by the expected mortality on the basis of the SOFA score for each patient. We determined that a linear model approximated the relationship between risk for death and days since most recent infection because the addition of days since most recent infection squared term did not significantly alter the model (Figure 1).