Differences in the relationship between pack-years and lung function measures by genetic ancestry https://datingranking.net/belarus-chat-room/ and race/ethnicity were tested in full multivariable models using the –2 log likelihood test of nested models with and without the interaction terms on an additive scale for lung function and lung density and a multiplicative scale for airflow obstruction. Sensitivity analyses were performed on the converse scales. As race and PCs of ancestry are collinear, they were not included in the same models; rather, two separate sets of analyses were performed. All models met the assumptions for linear and logistic regression, respectively. Presented results are untransformed. Statistical significance was defined as two-tailed p values <0.05. Analyses were performed using SAS V.9.2 (SAS Institute, Cary, North Carolina, USA).
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