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Table 2 Baseline characteristics of patients with COPD and healthy control subjects (means ± SD).

From: Angiotensin-converting enzyme I/D polymorphism in chronic obstructive pulmonary disease

  n Age F/M Pack/years Smokers Non-smokers Ex-smokers FEV1 (%) FEV1/FVC GOLD Stage
           I II III IV
COPD all patients 152 62.8
± 11.1
48/104 31.1
± 22.6
73
(48%)
13
(9%)
66
(43%)
52.6
± 20.9
58.6
± 14.9
18 40 80 14
Stable COPD 64 61.6
± 11.7
20/44 28.6
± 15.3
35
(55%)
2
(3%)
27
(42%)
59.1
± 18.9
60.2
± 14.6
7 18 34 5
Instable COPD 88 63.7
± 10.7
28/60 32.8
± 26.3
38
(43%)
11
(13%)
39
(44%)
48.0
± 21.1
57.4
± 15.0
11 22 46 9
Control 158 63.9
± 18.4
96/62 18.7
± 8.4
53
(34%)
12
(8%)
93
(59%)
81.5
± 20.1
96.8
± 24.1