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Table 1 Characteristics of Doetinchem cohort and Vlagtwedde-Vlaardingen cohort

From: Level and course of FEV1 in relation to polymorphisms in NFE2L2 and KEAP1 in the general population

 

Doetinchem cohort

(n = 1,152)

Vlagtwedde-Vlaardingen cohort

(n = 1,390)

Total duration of follow-up (years)

10

25

Number of visits (median)

3

7

The total number of FEV 1 measurements across all visits

3,115

8,159

Follow-up time frame, years

1997–2007

1965–1990

Males, n (%)

541 (47.0)

714 (51.4)

FEV 1 change in ml/year, mean (SD)

-26.2 (33.4)

-20.8 (22.9)

Last available:

  

FEV 1 level in liters, mean (SD)

3.31 (0.80)

2.86 (0.77)

Age in years, median (range)

53.7 (32–76)

52.0 (35–79)

Never smokers, n (%)

372 (32.3)

445 (32.0)

Packyears smoked in ever smokers, median (range)

13.2 (0.004–84.0)

18.9 (0.1–262.2)

  1. FEV1 = Forced Expiratory Volume in 1 second
  2. SD = Standard Deviation