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

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

Characteristic Total
Age (mean ± SD), years 48.5 ± 6.7
Smoking history (mean ± SD), pack-yearsa 40.4 ± 18.4
Baseline FEV1 post-bronchodilator (mean ± SD), % predictedb 78.55 ± 9.10
FEV1 post-bronchodilator rate of decline (mean ± SD), % predicted / yearc -0.97 ± 1.78
  1. aNumber packs of cigarettes smoked per day × number of years of smoking.
  2. bLung function at the start of the study measured as forced expiratory volume in 1 second (FEV 1).
  3. cChange in lung function over a five-year period measured as forced expiratory volume in 1 second (FEV 1).