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Table 3 Multivariate logistic regression for predictors of asthma among subjects with COPD:

From: The clinical features of the overlap between COPD and asthma

Variable OR [CI] p-value
African-American race 2.05 [1.31, 3.21] 0.002
Female gender 0.94 [0.63, 1.40] 0.76
Older age (per decade) 0.76 [0.60, 0.97] 0.03
Pack years of smoking (per 10 pack years) 0.86 [0.78, 0.95] 0.002