CSF2 and chronic obstructive pulmonary disease: There was no association in subjects with asthma or COPD with sputum GM-CSF concentration and percentage predicted FEV1 (r = −0.26, p = 0.09; r = −0.07, p = 0.7) or the FEV1/FVC (forced vital capacity) ratio (r = 0.06, p = 0.7; r = 0.1, p = 0.5), respectively.