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Bland-Altman plot of gastric reserve volume (GRV) measured by ultrasonography compared to manual aspiration. Sample size: 586; P (H0: mean=0) <0.001; 95% confidence interval [CI], 7.389–9.798; arithmetic mean, 8.6; standard deviation, 14.85; lower limit, –20.508 (95% CI, –2.568 to –18.448); upper limit, 37.695 (95% CI, 35.635 to 39.755).
