Table 2 Significant correlations of PBR, MFI, and PPV with laboratory data and acute/critical illness scores

CCI (points)

0.39 (0.08 to 0.63)*

–

–

CRP (mg/dl)

0.54 (0.26 to 0.74)***

− 0.59 (− 0.76 to − 0.32)***

− 0.61 (− 0.78 to − 0.35)***

Heart rate (pulse/min)

–

− 0.41 (− 0.64 to − 0.10)**

− 0.46 (− 0.68 to − 0.16)**

IL-6 (ng/ml)

0.45 (0.14 to 0.68)**

–

–

MAP (mmHg)

− 0.37 (− 0.62 to − 0.06)*

–

0.33 (0.01 to 0.58)*

PCT (ng/ml)

0.37 (0.37 to 0.62)*

–

–

SIRS score (points)

0.44 (0.14 to 0.67)**

–

− 0.41 (− 0.65 to − 0.11)**

SOFA score (points)

0.44 (0.14 to 0.67)**

–

–

Total serum protein (g/dl)

− 0.39 (− 0.64 to − 0.06)*

0.53 (0.23 to 0.73)***

0.50 (0.20 to 0.72)**