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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 (%)

Interval

Accumulated

n

r

p value

n

r

p value

Muscle mass

 Ultrasound

72

0.04

0.74

72

0.16

0.18

 BIA (Bioscan)

55

0.37

< 0.01

62

0.15

0.25*

 BIA (Physion)

60

0.51

< 0.01

64

0.45

< 0.01

Subcutaneous tissue by ultrasound

72

0.38

< 0.01

72

0.20

0.09

Fluid shift measured by BIA (Bioscan)

55

0.56

< 0.01

62

0.56

< 0.01

 Extracellular water

55

0.55

< 0.01

62

0.57

<  0.01

 Intracellular water

55

0.47

< 0.01

62

0.29

0.02

Fluid shift measured by BIA (Physion)

60

0.34

<  0.01

64

0.34

< 0.01

Body weight

67

0.57

< 0.01

65

0.43

< 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)