Among never smokers, participants with variable obstruction had a higher annual decline rate in FEV 1 /FVC (1.8±0.8%/year vs 0.9±0.5%/year, adjusted mean difference: 0.9 (95% CI −0.6 to 2.3), p=0.224) but did not reach statistical significance.
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Clinical features and 1-year outcomes of variable obstruction in participants with preserved spirometry: results from the ECOPD study in China.
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