Mean protein C activity levels over time for PROWESS placebo patients classified according to timing of death . Shown are means and standard errors (SE) of protein C levels based on time of death of PROWESS  drotrecogin alfa (activated) patients. Raw values with no imputation are included. PROWESS, Recombinant Human Activated Protein C Worldwide Evaluation in Severe Sepsis.
Vangerow et al. Critical Care 2007 11(Suppl 5):S4 doi:10.1186/cc6155