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Progression of FRCpleth over time in 152 patients with lung function stratified at age 6 to 8 years into 4 functional severity groups. Group PH&TG (pulmonary hyperinflation and trapped gas): FRCpleth and VTG > 2SDS; group PH (pulmonary hyperinflation without trapped gas): FRCpleth > 2SDS; group VIH (ventilation inhomogeneities): LCI > 2SDS; group FN: functionally normal.
