Figure 3: Cell viability for Calu-3 monolayers exposed to normoxia or hyperoxia with or without +20 cmH2O pressure. Cell viability decreased in both pressure-exposed groups ( ) but not in the control and hyperoxia only groups, which were not different from each other at 24 hrs ( ). By 72 hrs, cell viability was different in all groups, in which hyperoxia-exposed group was less than control group ( ) and greater than both pressure-exposed groups ( ). Data are ; different from all other groups at the same time point; less than control and hyperoxia groups ( for each condition).