Resolution: standard / high
Figure 4.
Analysis of median levels of erythropoietin (EPO) and haemoglobin (Hb) for cases (using all data from each patient), compared with comparator group subjects (single data values). (Comparator group subjects are referred to as 'controls'.) ARF, acute renal failure.
Elliot et al. Critical Care 2003 7:R35 doi:10.1186/cc2185