Fig. 4From: Detailed analysis of sputum and systemic inflammation in asthma phenotypes: are paucigranulocytic asthmatics really non-inflammatory?Relationship between sputum neutrophils (a) and eosinophils (b) and the number of pack-years in ex- and current smoker asthmatics. For sputum eosinophils, values of 0 were assigned to 0.1 because of the use of a logarithmic scaleBack to article page