Figure 3.

Correlation networks of quantitative small airway measures, spirometry, and endotoxin exposures in 2011 and 2016. Edge colors and types indicate the directions of the Pearson correlation coefficients. Solid red edges represent positive correlations and dashed blue edges represent negative correlations. Edge widths represent the magnitude of Pearson correlation coefficients. There were 404 textile workers in 2011 and 2016, respectively. E/I MLA = expiratory-to-inspiratory ratio of mean lung attenuation; Exp₋₈₅₆ = percentage of voxels with attenuation less than –856 HU on expiratory CT scans; pp FEV₁ = percent predicted FEV₁; Residual_–856 = residuals from the linear regression of Exp₋₈₅₆ on the percentage of voxels with attenuation less than –950 HU; RVC_{−856 to −950} = relative volume change in voxels with attenuation between –856 HU and –950 HU.