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Table 1 Study population

From: Differences in systemic adaptive immunity contribute to the ‘frequent exacerbator’ COPD phenotype

Characteristics Frequent exacerbation (n = 8) Infrequent exacerbation (n = 16) p
Age (years) 80.6 ± 11.2 74.1 ± 8.0 0.169
Gender (male) 6 11 0.751
Exacerbation Frequency (/y) 3.82 ± 0.92 1.70 ± 0.81 NA
Smoking Status (ex-smoker) 7 10 0.204
Pack years 51.6 ± 30.4 44.9 ± 26.7 0.605
FEV1 (L) 1.21 ± 0.47 1.54 ± 0.64 0.163
FVC (L) 2.41 ± 0.58 2.96 ± 0.86 0.079
FEV1 %pred (%) 52.6 ± 19.4 53.7 ± 18.4 0.892
FVC %pred (%) 91.1 ± 32.7 82.9 ± 18.7 0.527
FEV1/FVC 0.52 ± 0.20 0.51 ± 0.15 0.928
  1. Data expressed as mean ± SD except absolute number for gender and smoking status. Significance was calculated with chi-square or t test as appropriate. FEV 1 forced expiratory volume in 1 s, FVC forced vital capacity, %pred the percentage of predicted