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Mean ± SE of slope ratio data at intervals of 5% of forced vital capacity (FVC) from 20 to 80% of FVC. ○, Control (CON) data; gray circles, preterm without bronchopulmonary dysplasia (PRE) data; ●, bronchopulmonary dysplasia (BPD) data. *Significant difference from CON within a given interval, P < 0.05. %VC, %vital capacity.
