Figure 3

Boxplot of the nonaerated lung areas at different positive end-expiratory pressure (PEEP) levels (5, 10 and 15 cm H ₂ O) in ARDS patients. {the upper and the lower boundary of the "box" (grey-shaded area) represents the 75^th and 25^th percentile of the data, the central black line of the " box" is the median value and the vertical lines indicate the maximum and the minimum values}