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Table 1 Baseline characteristics* of the included versus excluded SAPALDIA participants

From: Glutathione S-transferase genotypes modify lung function decline in the general population: SAPALDIA cohort study

Variables:

Participants Included n = 4686

Participants Excluded† n = 4965

Women [N/%]

2455/52.4

2453/49.4

Age [years]

40.8 (± 11.5)

41.3 (± 11.8)

BMI at baseline [kg/m2]

23.7 (± 3.6)

24.2 (± 4.1)

Smoking

  

Non-smokers [N/%]

2325/49.6

1904/38.5

Former smokers [N/%]

948/20.2

1227/24.8

Current smokers [N/%]

1413/30.2

1819/36.7

Pack-years at baseline ‡

18.4 (± 18.4)

19.6 (± 20.1)

Lung Function

  

FEV1 [L]

3.6 (± 0.8)

3.5 (± 0.9)

FEV1 % pred. §

100.2 (± 13.3)

98.0 (± 14.8)

FEV1/FVC

79.2 (± 7.6)

78.9 (± 8.4)

FEV1/FVC <70%

468/10.1

510/12.0

  1. * expressed as mean (± SD) for quantitative variables and absolute numbers/percentages for categorical variable.
  2. † SAPALDIA participants at the baseline examination who did not participate at follow-up (n = 3678) [21] or who were excluded from the present analysis due to missing information on outcome or covariate data (n = 1287).
  3. ‡ mean of pack-years among ever smoking subjects. Participants were defined as ever-smokers if they had smoked at least 20 packs of cigarettes or 360 g of tobacco in their life.
  4. §FEV1 % predicted calculations based on SAPALDIA specific prediction equations [55, 56].