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Semi-quantitative assessment of cell morphology as the ratio of abnormal cells to total cells. Histological analysis did not show injury for the noninterventional comparator or the high flow nasal cannula groups at 4 and 8 hours, whereas the dry group demonstrated increasing injury over time. Data are mean ± SEM. *Group effect (P < 0.05). §Time effect (P < 0.05). n = 6/condition.
