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Table 1 Descriptive characteristics of the study population

From: Genome-wide DNA methylation and long-term ambient air pollution exposure in Korean adults

Characteristics

The Korean COPDa cohort (N = 100)

Age, years

72.8 ± 6.3

Male

66 (66%)

Body mass index, kg/m2

22.9 ± 2.9

COPD, case

60 (60%)

Cigarette smoking

  Never

39 (39%)

  Former

30 (30%)

  Current

31 (31%)

Pack-years

  Former smoker

28.9 ± 19.6

  Current smoker

35.7 ± 19.1

Annual average air pollution concentration at residential addresses

  PM10, μg/m3

45.1 ± 2.0

  NO2, ppb

13.1 ± 1.4

  1. N (%) or mean ± standard deviation reported
  2. aChronic obstructive pulmonary disease