Fig. 2
Description of the timing and number of echocardiograms in infants with and without late PH. Infants were categorized as having late pulmonary hypertension (late PH) if their final echocardiogram in the hospital showed PH. For infants with only one echocardiogram, the final study was their first echocardiogram. For infants with more than one study, the final echocardiogram of the neonatal course was captured. Echocardiograms were performed by clinical pediatric cardiologists and quantitative variables (tricuspid regurgitation jet velocity) and qualitative variables (shunt directions, septal flattening, degree of right ventricular dysfunction/dilation/hypertrophy) were measured. Panel a shows the distribution of the day of life for the first and final echocardiogram of the infants in the entire cohort. Panel b shows the day of life that the echocardiograms were obtained, the number of studies by group, and the day of life and sequence of the first and final echocardiogram. * missing day of life information in the late PH group (n = 8), and in the without late PH group (n = 53). #2 infants had missing study number information in both groups