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Table 1 General characteristics of the study subjects from the 2005 Korea National Health and Nutrition Examination Study

From: Exposure to environmental tobacco smoke among South Korean adults: a cross-sectional study of the 2005 Korea National Health and Nutrition Examination Survey

  Male Female Total
  n % n % n %
Sex       
   Male      3509 45.0
   Female      4292 55.0
Age groups (years)       
   19-29 583 16.6 753 17.5 1336 17.1
   30-39 811 23.1 930 21.7 1741 22.3
   40-49 872 24.9 1006 23.4 1878 24.1
   50-59 579 16.5 650 15.1 1229 15.8
   60-69 445 12.7 525 12.2 970 12.4
   70+ 219 6.2 428 10.0 647 8.3
Education       
   College & above 526 15.3 1214 28.8 1740 22.7
   High 376 10.9 476 11.3 852 11.1
   Middle 1449 42.1 1594 37.8 3043 39.7
   Elementary & less than 1093 31.7 935 22.2 2028 26.5
Income       
   1(highest) 901 26.0 1097 25.8 1998 25.9
   2 890 25.7 1097 25.8 1987 25.8
   3 830 24.0 1028 24.2 1858 24.1
   4(lowest) 843 24.3 1028 24.2 1871 24.3
Location of residence       
   Rural 715 20.4 849 19.8 1564 20.1
   Urban 2794 79.6 3443 80.2 6237 80.0
Marital status       
   Never married 746 21.3 672 15.7 1418 18.2
   Married 2533 72.3 2781 64.8 5314 68.2
   Others 227 6.5 836 19.5 1063 13.7
Smoking Status       
   Non-smoker 696 19.8 3929 91.5 4625 59.3
   Ex-smoker 999 28.5 123 2.9 1122 14.4
   Current smoker 1814 51.7 240 5.6 2054 26.3