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Table 1 General characteristics of subjects according to city of residence

From: A cross-sectional study on the pulmonary function of residents in two urban areas with different PM10 concentrations: data from the fourth Korea national health and nutrition examination survey (KNHANES) 2007–2009

Variables Total (N = 830) Seoul (N = 749) Jeju (N = 81) p value
N (%) or Mean (SE) N (%) or Mean (SE) N (%) or Mean (SE)
Sex 0.664
 Male 379 (52.4) 340 (52.2) 39 (54.1)  
 Female 451 (47.6) 409 (47.8) 42 (45.9)  
Education level 0.011
 Low 279 (29.1) 264 (30.1) 15 (15.0)  
 High 551 (70.9) 485 (69.9) 66 (85.0)  
Household income 0.001
 Low 294 (33.6) 278 (34.9) 16 (16.0)  
 High 536 (66.4) 471 (65.1) 65 (84.0)  
Occupational class 0.097
 Blue collar 257 (30.1) 241 (30.8) 16 (21.2)  
 White collar 573 (69.9) 508 (69.2) 65 (78.8)  
Smoking status 0.707
 Smoker 335 (45.4) 304 (45.6) 31 (43.2)  
 Non-smoker 495 (54.6) 445 (54.4) 50 (56.8)  
Drinking status 0.004
 Heavy 214 (28.5) 184 (27.8) 30 (37.8)  
 Social 616 (71.5) 565 (72.2) 51 (62.2)  
Age (years) 47.3 (0.5) 47.6 (0.6) 43.7 (0.5) < 0.001
Height (centimeter) 163.6 (0.3) 163.5 (0.4) 165.0 (0.8) 0.093
Bodyweight (kilogram) 65.7 (0.4) 65.5 (0.4) 68.4 (1.1) 0.018
Residence period (years) 12.5 (0.5) 12.6 (0.5) 11.8 (0.9) 0.466
  1. p value were calculated by chi-square test or T-test to compare Seoul with Jeju
  2. SE standard error