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Table 1 Characteristics of study groups

From: Neutrophil extracellular trap (NET) formation characterises stable and exacerbated COPD and correlates with airflow limitation

Study group Age Sex FEV1 % predicted GOLD grade Smoking history pack years
  mean (min-max) m f mean (min-max) 0 I II III IV 10-40 41-70 >70
Exacerbated COPD 67.5 (46–87) 11 5 32.3 (14–57) 0 0 2 4 10 6 9 1
Stable COPD 66.5 (42–74) 15 13 48.0 (23–80) 0 1 10 8 8 9 12 7
Smoking controls 47.5 (40–57) 9 8 91.1 (80–109) 17 0 0 0 0 14 2 1
Non-smoking controlsa 59.7 (41–77) 7 8 106.3 (93–129) 15 0 0 0 0 1 0 0
  1. aNote that non-smoking controls included only one ex-smoker who stopped smoking more than 10 years before entering the study