Table 2.
Correlation of bioimpedance measurements and bioimpedance-derived body composition to MR-derived tissue sodium concentration for the entire cohort
| Na+M | Na+SC | Na+AveSC+M | ||||
|---|---|---|---|---|---|---|
| r | p value | r | p value | r | p value | |
| Serum osmolality | 0.222 | 0.239 | 0.488 | 0.006* | 0.382 | 0.037* |
| Bioimpedance measurements | ||||||
| Re | − 0.415 | 0.023* | − 0.694 | < 0.001* | − 0.598 | < 0.001* |
| Ri | 0.160 | 0.397 | − 0.257 | 0.170 | − 0.050 | 0.795 |
| Capacitance | − 0.402 | 0.028* | 0.010 | 0.956 | − 0.206 | 0.276 |
| Z | ||||||
| 5 kHz | − 0.423 | 0.020* | − 0.712 | < 0.001* | − 0.609 | < 0.001* |
| 100 kHz | − 0.289 | 0.122 | − 0.650 | < 0.001* | − 0.499 | 0.005* |
| Φ | ||||||
| 5 kHz | − 0.481 | 0.007* | − 0.169 | 0.372 | − 0.372 | 0.043* |
| 100 kHz | − 0.634 | < 0.001* | − 0.454 | 0.012* | − 0.588 | 0.001* |
| Body composition estimations | ||||||
| TBW/weight | − 0.128 | 0.501 | 0.145 | 0.444 | − 0.017 | 0.928 |
| ECW | 0.217 | 0.249 | 0.507 | 0.004* | 0.384 | 0.036* |
| OH | 0.495 | 0.005* | 0.432 | 0.017* | 0.507 | 0.004* |
The bold value is used for correlation co-efficient and p-values with statistical significance
The relationship between variables was assessed using Spearman’s correlation. ECW extracellular water, Na+AveSC+M average of muscle and subcutaneous sodium, Na+M muscle sodium, Na+SC subcutaneous sodium, OH overhydration index, r correlation coefficient, Re extracellular resistance, Ri intracellular resistance, TBW total body water, Z impedance, Φ phase angle
*Indicates significance of < 0.05