Figure 2From: Association of current smoking with airway inflammation in chronic obstructive pulmonary disease and asymptomatic smokersSpearman's rank correlation: Cigarettes smoked per day and percentage of macrophages in biopsies. COPD (â– , ): rho = 0.69 p = 0.002 and asymptomatic smokers(â–¡, ): rho = 0.46 p = 0.03.Back to article page