Table 4
Published regression models predicting total body water in neonates
| Reference | n = | Age (days) | Weight (kg) | Equation | R2 | Residual SD |
|---|---|---|---|---|---|---|
| Mayfield et al 7 1991 | 15 | 1 | < 2.5 | TBW (ml) = 523 + 217.6 wt H2/R | 95.34-150 | |
| 17 | 4-7 | < 2.5 | TBW (ml) = 567 + 235.8 wt H2/R | 91.64-150 | ||
| Kushner et al 10 1992 | 175 | See text | See text | TBW† ‡ (kg) = 0.04 + 0.065 wt + 0.593 H2/R | 0.13 | |
| = −0.32 + 0.7 H2/R | 0.15 | |||||
| Novak et al 9 1992 | 32 | 6-10yr | — | TBW‡ (kg) = 0.158 + 0.662 H2/Xc | ||
| Wilson et al8 1993 | 17 | 21-71 | 0.871-1.919 | TBW‡(kg) = 0.55 L2/I + 0.09 | 92.04-150 | |
| Present study | 28 | < 7 | 0.690-3.510 | TBW (l) = 0.135 + 0.516 wt + 4.074 L2/R | 99.4 | 0.042 |
| = 0.144 + 15.518 L2/R | 96.4 | 0.099 |
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↵4-150 Calculated from published data; † Included subjects from Mayfield et al 7; ‡ Repeated measures. All readings made at 50 kHz; H: height in cm; L: foot length in cm; R: resistance; Xc: reactance; wt: weight in kg.
