RESULTS
This study included a total of 286 adolescents with technically acceptable spirometry results (Figure 1). Pulmonary volumes and lung diffusion measurements were obtained from 121 and 101 participants, respectively. Descriptive data during the neonatal period and at early follow-up (first 6 years of life), findings of skin prick tests, and parental history are presented in Table 1. E-table 1 shows BPD definitions used in the centers, the BPD sub-classification based on severity, and the incidence and duration of home oxygen therapy. Approximately 28% of infants with BPD required oxygen supplementation at home, with an average duration of 3 months (1st and 3rd Q 2 and 6, respectively). Mean (SD) duration of home oxygen therapy was significantly longer in the “high-severity” BPD subgroup than in the “low severity” BPD subgroup (3.06 [6.40] vs. 0.23 [0.63] months; p = 0.003).