Fig. 2From: Asthma in elderly is characterized by increased sputum neutrophils, lower airway caliber variability and air trappingResidual volume on total lung capacity ratio according to age group. Patients younger than 40 years old (group 1), aged between 40 and 70 (group 2) or older than 70 years old (group 3). Group 1 different from group 2 (p < 0.00001) and from group 3 (p < 0.00001). Group 2 different from group 3 (p < 0.00001)Back to article page