Figure 1From: Economic and health consequences of non-invasive respiratory support in newborn infants: a difference-in-difference analysis using data from the Norwegian patient registry Flow chart describing the study population. *’Respiratory symptoms’ include the diagnoses respiratory failure, respiratory distress syndrome, persistent pulmonary hypertension, transitory tachypnoe of the newborn/wet lung, meconium aspiration syndrome and perinatal asphyxia.Back to article page