Demographic, phenotypic, and genotypic characteristics by race^*

*FEV1 denotes forced expiratory volume in 1 second, FVC forced vital capacity, SD standard deviation, ADRB2 beta2 adrenergic receptor gene **GOLD Stage II obstructive lung disease defined as percent-predicted FEV1<80% and FEV1/FVC<70% based on criteria from the Global Initiative for Chronic Obstructive Lung Disease [26] †p<0.05 for test of difference across race using χ2 test of heterogeneity for Rx2 contingency table for categorical variables or ANOVA F test for continuous variables, transformed as needed