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. 2021 Jul 7;38(12):1274–1283. doi: 10.1097/EJA.0000000000001565

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Fig. 1 — Group assignment, positive end-expiratory pressure and FiO₂ in the higher (pink) and lower (green) positive end-expiratory pressure groups, before (left panels) and after (right panels) matching. The figure shows the median, lowest and highest positive end-expiratory pressure and FiO₂ values. Horizontal bars inside boxes represent medians; box tops and bottoms, interquartile ranges. Whiskers extend to 1.5 times the interquartile range beyond the first and third quartiles per the conventional Tukey method. Circles represent means.