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The incidence of chronic lung disease (CLD) in preterm infants per interquartile distributions of 8-hydroxydeoxyguanosine (8-OHdG) in the cord blood at birth and in the urine on Days 1 and 7. Pairwise deletions were used for missing data. Fisher’s exact tests were used to compare distributions between infants without/with CLD in the cord blood (p = 1.0), the urine on Day 1 (p = .89), and the urine on Day 7 (p = .03). *p < .05.
