CD8A and bronchopulmonary dysplasia: In adults who were born prematurely (preterm and BPD combined), the proportion of lymphocytes was correlated with FVC-z-score in a negative manner (r = -0.324, p = 0.036), while the proportions of CD8 + T cells showed a correlation with FEV1-z-score in a negative manner (r = -0.448, p = 0.048).