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Table 2 Prevalence of emphysema on chest films and HRCT

From: Emphysema prevalence related air pollution caused by a cement plant

Variables Number Chest films HRCT
N (%) p-value N (%) p-value
Group LEG 317 29 (9.1) 0.017 36 (11.4) 0.007
MEG 1,046 150 (14.3)   186 (17.8)  
Sex Female 849 69 (8.1) 0.000 84 (9.9) 0.000
Male 514 110 (21.4)   138 (26.8)  
Age ≤59 395 20 (5.1) 0.000 24 (6.1) 0.000
60–69 410 46 (11.2)   59 (14.4)  
≥70 558 113 (20.3)   139 (24.9)  
BMI ≥25.0 562 32 (5.7) 0.000 50 (8.9) 0.000
24.9–20.0 689 96 (13.9)   125 (18.1)  
≤19.9 112 51 (45.5)   47 (42.0)  
Residency period ≤24 389 24 (6.2) 0.000 44 (11.3) 0.002
≥25 974 155 (15.9)   178 (18.3)  
Smoking Never 929 81 (8.7) 0.000 99 (10.7) 0.000
≤29 206 33 (16.0)   42 (20.4)  
≥30 228 65 (28.5)   81 (35.5)  
Firewood Not use 684 71 (10.4) 0.003 94 (13.7) 0.011
Use 679 108 (15.9)   128 (18.9)  
Income ≥100 437 33 (7.6) 0.000 48 (11.0) 0.000
≤99 926 146 (15.8)   174 (18.8)  
  1. P-value by chi-square test
  2. MEG: ‘more exposed group’ who lived within the 1 km radius of the cement plant
  3. LEG: ‘less exposed group’ who lived 5 km or more away from the cement plant in not related to usually wind direction
  4. Age and Residency period: years, Body mass index(BMI); kg/m2, Smoking; pack-years, Income: ten thousand won (Korean)/month
  5. Chest films; Chest PA and Lateral view, HRCT; High-resolution computed tomography