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T2 MRI relaxometry‐based AAo SaO2 estimates versus DAo SaO2 estimates (%), grouped by DA flow direction. As there were not enough unpaired measurements for optimal pooled t‐test, unpaired t‐test was performed with age and sex collapsed (p < 0.05). Only “bidirectional” DA flow showed a statistically significantly higher AAo SaO2. DAo, descending aorta; DA, ductus arteriosus
