Nitric oxide synthase polymorphisms, gene expression and lung function in chronic obstructive pulmonary disease

BMC Pulmonary Medicine

Table 1 Characteristics of the 4132 Lung Health Study participants (2611 male, 1521 female)

Characteristic	Total
Age (mean ± SD), years	48.5 ± 6.7
Smoking history (mean ± SD), pack-years^a	40.4 ± 18.4
Baseline FEV₁ post-bronchodilator (mean ± SD), % predicted^b	78.55 ± 9.10
FEV₁ post-bronchodilator rate of decline (mean ± SD), % predicted / year^c	-0.97 ± 1.78

^aNumber packs of cigarettes smoked per day × number of years of smoking.
^bLung function at the start of the study measured as forced expiratory volume in 1 second (FEV ₁).
^cChange in lung function over a five-year period measured as forced expiratory volume in 1 second (FEV ₁).

ISSN: 1471-2466