What percentage risk did Vincent face for a heart disorder at birth?

Vincent, the character in the film "GATTACA," was genetically engineered to be free of most hereditary diseases, but his parents chose to forego the enhancements for some of the traits, making him a "natural" or "in-valid" child. Despite being born without the genetic modifications that would typically reduce the likelihood of various health issues, it is emphasized in the film that he had a significant risk of heart disorders due to his genetic predisposition.

The reason for the 99% risk is closely tied to the advanced genetic screenings and predictions made during that time in the narrative of the film. The technology in the "GATTACA" universe allowed for precise estimations of health risks based on genetic information, which indicated that Vincent had an extremely high likelihood—up to 99%—of developing a heart condition over the course of his life. This portrayal highlights the deterministic views on genetics within society in "GATTACA," further driving the narrative around genetic discrimination and the value of human spirit and determination over genetic predisposition.