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Sum of relative impedance change in dependent and non-dependent lung regions. The sum of ΔZQ and ΔZV and ΔZV/ΔZQ in dependent and non-dependent regions for supine, prone, left and right lateral position (mean and confidence interval (CI)). # indicates a significant difference between positions in the non-dependent lung and † indicates significant difference within the same position between dependent and non-dependent lung (P < 0.05).
