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Age- and sex-related reference values for absolute PEmax (maximal expiratory mouth pressure) in boys (a) and girls (b), as well as for PEmax normalized for fat-free mass (FFM) in boys (c) and girls (d). The thick solid line represents the 50th percentile (P50); dotted lines correspond to the 10th, 25th, 75th, and 90th percentiles (P10, P25, P75, and P90, respectively); solid lines indicate the 3rd and 97th percentiles (P3 and P97, respectively).
