The goal of this retrospective observational study is to \[learn about the correlation between hyperbilirubinemia and retinopathy of prematurity in preterm infants. The main question it aims to answer are: • To evaluate the possible effect of neonatal jaundice linked to the presumed protective antioxidant action of bilirubin on the development of ROP, compared to a control group which, although presenting ROP, did not develop jaundice.
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Number of subjects who developed Retinopathy of Prematurity (ROP) (divided by severity)
Timeframe: between 01/01/2010 and 12/31/2020
Number of subjects who developed jaundice
Timeframe: between 01/01/2010 and 12/31/2020
Duration of jaundice (days) for each subject
Timeframe: between 01/01/2010 and 12/31/2020