. Author manuscript; available in PMC: 2015 Aug 4.

Published in final edited form as: J Occup Environ Med. 2013 Jul;55(7):846–850. doi: 10.1097/JOM.0b013e31828dc985

TABLE 3.

Demographics and CWP Prevalence by Lung Function Status (N = 6373)^*

	Impaired (n = 836)	Not Impaired (n = 5537)	P
Age, mean (SD; range), y	48.6 (9.3; 21–74)	46.6 (10.6; 18–74)	<0.0001
Weight, mean (SD; range), kg	96.9 (20.2; 49.5–202.7)	92.8 (16.6; 47.7–183.2)	<0.0001
Tenure underground, mean (SD; range), y	19.3 (12.8; 0–58)	18.1 (12.9; 0–60)	<0.05
Current smoker, n (%)	303 (36.2)	1105 (20.0)	<0.0001
BMI ≥ 30 kg/m², n (%)	476 (56.9)	2776 (50.1)	<0.001
Simple CWP, n (%)	54 (6.60)	156 (2.83)	<0.0001
PMF, n (%)	18 (2.15)	27 (0.49)	<0.0001

Sex, race, and height not significantly different between the two groups.

BMI, body mass index; CWP, coal workers' pneumoconiosis; PMF, progressive massive fibrosis; y, years.