[Retracted] Environmental and Genetic Factors in the Pathogenesis of COPD in the Road-Working Population

Table 1

Characteristics of enrolled participants.

	Group A (43 total)	Group B (39 total)	Group C (52 total)	value (A vs. B)	value (A vs. C)
Age				0.31	0.86
Gender (male)	40	35	43	0.60	0.13
Years of road work			—	0.42	—