Demographic and clinical characteristics of the study subjects.

N.A, not applicable; APACHE, acute physiology and chronic health evaluation; SOFA, sequential organ failure assessment. P1, sepsis group vs severe sepsis group. P2, survivor group vs non-survivor group.N.A.：不适用（not applicable）；APACHE：急性生理学与慢性健康状况评分系统（acute physiology and chronic health evaluation）；SOFA：序贯器官衰竭评分（sequential organ failure assessment）。P1：脓毒症组与重症脓毒症组对比；P2：存活组与非存活组对比。