Table 2.

Baseline bioelectrical impedance spectroscopy (BIS) measurements by study site and treatment group (n=58)

University of MichiganUniversity of North Carolina at Chapel Hill
Measurement of BISGroup 1, n=17Group 2, n=20Group 1, n=12Group 2, n=9
Phase 1 dietSalt restrictedUsualSalt restrictedUsual
Calf BIS
 Total body water (TBW), L0.65±0.170.72±0.200.68±0.170.62±0.18
 Extracellular volume (ECV), L0.18±0.040.20±0.080.17±0.030.16±0.03
 Intracellular volume (ICV), L0.47±0.150.52±0.150.51±0.150.46±0.19
 ECV/ICV0.41±0.110.40±0.110.35±0.100.43±0.25
 ECV/TBW0.29±0.050.28±0.050.26±0.050.28±0.12
 ECV/weight, 100×L/kg0.19±0.040.20±0.050.19±0.030.18±0.05
 Calf standardized resistivity, Ω·m3/kg0.14±0.040.14±0.040.17±0.030.14±0.06
Sum of segment BIS
 TBW, L49.1±12.051.5±8.945.5±10.4140.9±7.3
 ECV, L21.7±5.723.6±5.021.4±4.620.9±3.2
 ICV, L27.4±6.728.0±4.624.2±6.220.0±4.6
 ECV/ICV0.80±0.100.85±0.120.90±0.131.23±0.58
 ECV/TBW0.44±0.030.46±0.040.47±0.040.51±0.04
 ECV/weight, L/kg0.23±0.040.24±0.030.24±0.030.23±0.03
Whole-body BIS
 TBW, L48.7±15.447.9±9.345.1±10.539.4±9.2
 ECV, L20.2±5.621.3±4.419.3±4.218.1±3.6
 ICV, L28.5±10.826.6±5.425.9±6.521.3±5.9
 ECV/ICV0.74±0.120.81±0.100.75±0.070.87±0.16
 ECV/TBW0.42±0.040.45±0.030.43±0.020.46±0.04
 ECV/weight, L/kg0.21±0.030.22±0.020.22±0.030.20±0.03
  • Mean±SDs are reported.