Fig. 4.

Correlation-based network analyses in (A) all subjects and in (B) all premature subjects (preterm + BPD). Significant pairs identified by the Spearman correlation test (coefficient r < 0.3, p < 0.05) are connected by edges with the width representing the significance (-log10(p-value)). Abbreviations: BPD: bronchopulmonary dysplasia; BMI: body mass index; FEV₁: forced expiratory volume in 1 s; FVC: forced vital capacity; FeNO: fractional exhaled nitric oxide; CPAP: continuous positive airway pressure; APGAR: Apgar-score; Post: post bronchodilator; BW: bronchial wash; BAL: bronchoalveolar lavage; lymphocytes (BW) and *(BW): the proportion of lymphocytes included and excluded epithelial