IL6 and bronchopulmonary dysplasia: Although the p-value obtained from the multivariable logistic regression analysis showed a significant statistical difference in the IL-6 in cord blood obtained within 24 h of birth for the two groups, the OR was very small; thus, for every 1-pg/ml increase in cord blood IL-6, the impact on the increased risk of BPD was negligible, which suggests that IL-6 may have limited predictive value for the onset of BPD because the upper limit of 95% CI of the IL-6 level was close to 1.0.