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Table 1 Mean values for volumes of expired air and mean for all three ultrasound methods to measure diaphragm movement

From: The Area method: a new method for ultrasound assessment of diaphragmatic movement

  Mean SD Minimum Maximum n, observation
M-mode, cm 6.6 2.4 1.9 10.8 79
Volume of expired air, l 4.5 2.3 0.8 8.4 79
B-mode, cm 3.0 1.8 0.4 7.4 79
Volume of expired air, l 3.8 2.3 0.4 7.3 79
Area Method, cm2 89.8 51.0 17.0 197.0 72
Volume of expired air, l 3.8 2.2 0.4 7.3 72