ESR1 and macrophage activation syndrome: As shown in this table, the mean values of the following variables were significantly higher in the MAS group: WBC2-WBC1, WBC3-WBC2, PMN1-PMN2, PMN3-PMN2, Hgb1-Hgb2, PLT1-PLT2, PLT3-PLT2, ESR1-ESR2, and CRP1-CRP2.