Figure 6.

Quantification of cytokines in the nasal lavage of study subjects. Analytes that showed significant differences between the study groups are shown in box-whisker plots. Plots reflect the first and third quartile (lower and upper boundary of box, respectively), median (in-box line), mean (diamond), and minimum and maximum values (lower and upper whisker, respectively) for the corresponding study group. Outliers are represented by open circles. NS: never-smoker; CS: current smoker; COPD: subjects with chronic obstructive pulmonary disease. Unadjusted P values were estimated by paired t-tests: ***P <.001, **P < .01, *P< .05.