Table 2.

Distribution of demographic characteristics for subjects in the Vlagtwedde-Vlaardingen cohort

	Nondecliners (n = 300)	Fast Decliners (n = 233)	P Value
Men/Women	215/85	162/71	0.590
Age, yr	49.7 ± 9.6	53.05 ± 9.7	<0.0001
Smoking history, pack-years*	23.5 ± 16.8	29.4 ± 19.0	<0.0001
ΔFEV1/yr, % predicted pre†	0.9 ± 0.7	−0.5 ± 0.5	<0.0001
ΔFEV1/yr, % predicted post‡	NA	NA
Baseline FEV1, % predicted pre§	96.2 ± 15.1	100.6 ± 14.7	0.001
Baseline FEV1, % predicted post∥	NA	NA

Values are means ± SD for continuous data.

^*Number of packs of cigarettes smoked per day/number of years smoking.

^†Change in lung function over the total period someone was in the study per year as % predicted FEV₁ prebronchodilator.

^‡Change in lung function over the total period someone was in the study per year as % predicted FEV₁ postbronchodilator.

^§Lung function at the start of the Vlagtwedde/Vlaardingen as measured by FEV₁(%) predicted prebronchodilator.

^∥Lung function at the start of the Vlagtwedde/Vlaardingen as measured by FEV₁(%) predicted postbronchodilator.