DNASE1, PGLYRP1, B2M remained significantly associated with pPRISm in multivariable modelling (p-values 0.008, 0.011, 0.018 respectively) with B2M also being significantly associated with a history of BPD in the multivariable model (p = 0.003). This evidence concerns the gene B2M and bronchopulmonary dysplasia.