Comparability of input parameters in the German Retina.net ROP registry and the EU-ROP registry - An exemplary comparison between 2011 and 2021.

Purpose: The German Retina.net ROP registry and its Europe-wide successor, the EU-ROP registry, collect data from patients treated for ROP. This analysis compares input parameters of these two registries to establish a procedure for joint analyses of different registry data using exemplary datasets from the two registries.