Figure 1:
Detection frequency and levels of blood VOCs (A) and forest plot for the association of VOCs with reversible and non-reversible airflow obstruction (B).
** P < 0.01 *** P < 0.001
(a) Detection of chemical (b) Log10-transformed concentrations of chemical
Abbreviations: VOC, volatile organic compound; MTBE, methyl-tert-butyl ether.
Models adjusted for age, poverty income ratio, body mass index, and log-transformed pack-years of cigarette smoking used as continuous variables, and sex, race/ethnicity, past and current smoking status, and exposure to environmental tobacco smoke used as categorical variables.