Fig. 3

Bland and Altman plot for tidal volume in ICU patients, using various measures and estimates. VT tidal volume, PBW predicted body weight, ABW actual body weight, VT Measured tidal volume set using the measured height, VT Chumlea S tidal volume set using the Simplified Chumlea height estimate. Tidal volume setting grandly vary while using either PBW or ABW, with as much as a 3.7 mL/kg range, whereas the mean bias remains low (−0.9 mL/kg). VT settings using either the measured PBW or its estimate (visual height estimation) are consistent. The simplified Chumlea method is consistent with the one using the measured value, generally providing a 1.1 mL/kg lower value