Skip to main content

Table 2 Relationship against fluid balance (interval and accumulated)

From: Monitoring of muscle mass in critically ill patients: comparison of ultrasound and two bioelectrical impedance analysis devices

Percentage change (%)IntervalAccumulated
nrp valuenrp value
Muscle mass
 Ultrasound720.040.74720.160.18
 BIA (Bioscan)550.37< 0.01620.150.25*
 BIA (Physion)600.51< 0.01640.45< 0.01
Subcutaneous tissue by ultrasound720.38< 0.01720.200.09
Fluid shift measured by BIA (Bioscan)550.56< 0.01620.56< 0.01
 Extracellular water550.55< 0.01620.57<  0.01
 Intracellular water550.47< 0.01620.290.02
Fluid shift measured by BIA (Physion)600.34<  0.01640.34< 0.01
Body weight670.57< 0.01650.43< 0.01
  1. Interval: all variables are the changes (%) between each measurement day. Accumulated: all variables are the changes (%) from day 1 to measurement days. The Pearson correlation coefficient was used to investigate the relationships. BIA bioelectrical impedance analysis
  2. *The correlation of Bioscan was significant only at day 3 (r = 0.69, p < 0.01 at day 3, r = − 0.06, p = 0.83 at day 5, r = 0.18, p = 0.51 at day 7, r = − 0.12, p = 0.71 at day 10)