FIG. 4.

Nomogram representing mean values of lipid peroxidation byproducts in urine of preterm infants. Straight line represents the mean values and dotted lines above and below standard deviation of the mean. Representation: (A) Isoprostanes; (B) Isofurans; (C) Neuroprostanes; and (D) Neurofurans. Urine samples were obtained from very preterm infants (<32 weeks of gestation) that did not develop free radical-associated conditions recruited in two randomized, controlled, and blinded clinical trials (REOX trial, n=112 and ROTTERDAM trial, n=358; Ref. 5) given in AU corresponding to normalized peak area values using the IS. AU, arbitrary units; IS, internal standard.