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. 2016 May 3;124(9):1436–1442. doi: 10.1289/EHP195

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Correlation between CT measure of percent emphysema (using cutoff of –950 Hounsfield units, LAA_I-950) and 15th percentile density across all exposure subgroups. Correlation was high (Pearson correlation –0.87, Spearman correlation –1.00) and suggested that the percent emphysema measure may actually be reflecting changes in lung density, and not a true measure of emphysema.