No members of the control group had frothy fluid or sediment in the airways or sinuses, 11 (92 percent) had subglottic airway, tracheal and bronchial fluid.

• 对照组中呼吸道或鼻旁窦中窦没有发现泡沫液体或沉积物，11（92%25）声门下呼吸道，气管和支气管内有液体存在。