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. Author manuscript; available in PMC: 2015 Nov 4.
Published in final edited form as: Chest. 2015 Nov 1;148(5):1293–1299. doi: 10.1378/chest.15-0118

Table 1.

Results of multiple linear regression analysis of associations between spirometric lung function values and radiographic profusion among underground coal miners participating in the Enhanced Coal Workers’ Health Surveillance Program, 2005–2013, n = 8,230

Beta Lower 95% CI Upper 95% CI
% Predicted FEV1
 Profusion (0/0 to 2/3)a −1.46 −1.88 −1.04
 Smoking status (never/ever) −4.09 −4.71 −3.47
 Body mass index (cont.) −0.31 −0.37 −0.25
 Underground tenure (years) −1.02 −1.30 −0.73
% Predicted FVC
 Profusion −0.97 −1.34 −0.60
 Smoking status −0.59 −1.13 −0.04
 Body mass index −0.49 −0.54 −0.44
 Underground tenure −0.67 −0.92 −0.42
FEV1/FVC
 Profusion −0.59 −0.80 −0.37
 Smoking status −3.15 −3.46 −2.83
 Body mass index 0.10 0.07 0.14
 Underground tenure −1.46 −1.61 −1.32

CI, Confidence interval; FEV1, Forced expiratory volume in 1 second; FVC, Forced vital capacity; cont., continuous variable

a

Profusion of small pneumoconiotic opacities, per International Labor Office (ILO) guidelines