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Mean (SE) increase from baseline of FEV1 after salbutamol 400 μg in the entire group (105 subjects), in 76 patients with a basal FEV1 <90% predicted, in 88 subjects without concomitant obstructive lung diseases (No OLD), and in 48 previously healthy asymptomatic non-smokers (Healthy NS). *P < 0.05, **P < 0.01, ***P < 0.001 vs pre salbutamol.
