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Crosstab comparison of initial z-scores of FEV1 (mean during age range of 5 to 8 years) and oxygenation under 4 different conditions: (i) decreased airway patency (FEV1 < -2SDS) and normocarbia (PaCO2 > = 34 mmHg), (ii) normal airway patency and normocarbia, (iii) decreased airway patency and hypocarbia, and (iv) normal airway patency and hypocarbia.
