Airway glutathione characteristics. A, GSH. B, GSSG. C, % GSSG. D, The redox potential (Eh) of the GSH/GSSG pair in the ELF. Data represent the means ± SEMs per mL of ELF with AC = adult control (n = 31), PC = pediatric control (n = 6), AO− = severe asthma without airway obstruction (n = 31), and AO+ = severe asthma with airway obstruction (n = 25). *P < .01 vs adult controls; †P < .05 vs pediatric controls.