DSG1 and asthma: Univariable linear regression analyses for DSG1, DSC1 and JUP (Table 3) identified that a history of BPD had significant association with each of these three proteins (β−0.23, p = 0.014; β−0.27, p = 0.019; β−0.23, p = 0.008 respectively) but sex, age, diagnosis of asthma and low lung function did not.