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

Table 1 Characteristics of study groups

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 controls^a	59.7 (41–77)	7	8	106.3 (93–129)	15	0	0	0	0	1	0	0

^aNote that non-smoking controls included only one ex-smoker who stopped smoking more than 10 years before entering the study

ISSN: 1465-993X