Among ever smokers, a positive trend in AO incidence was found in men as age increased [1.05 (1.03–1.07)], whereas this age trend was lees steep and did not reach statistical significance in women [1.02 (0.99–1.04)] (Fig. 3 ).
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Incidence trends of airflow obstruction among European adults without asthma: a 20-year cohort study.
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