Demographic and Clinical Characteristics of Participants at Birth and Randomization Baseline
Abbreviations: EPOPé, Obstetrical, Perinatal and Pediatric Epidemiology Research Team at the Center for Research on Epidemiology and Statistics Sorbonne Paris Cité; TFU, transfontanellar ultrasonography.Data are presented as the number of participants with data/total number (percentage) unless otherwise indicated.Higher socioprofessional status comprises 3 working categories: managerial, intermediate, and administrator. Lower socioprofessional status comprises 2 categories: domestic or sales employee.Mild was defined as 28 or more days of oxygen and spontaneous respiration-room air at 36 weeks; moderate, 28 or more days of oxygen and mechanical ventilation or continuous positive airway pressure or fraction of inspired oxygen greater than 21% at 36 weeks; and severe, 28 or more days of oxygen and mechanical ventilation or continuous positive airway pressure or fraction of inspired oxygen 30% at 36 weeks.At least 1 parent with a minimum of 1 year of university education.