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Table 5 Patient characteristics with respect to distance from the accident site

From: Acute Symptoms after a Community Hydrogen Fluoride Spill

  Under 100 m 100m-1 km Over 1 km p-value*
N % N % N %
Sex        0.000
 Male 149 65.6 418 58.0 249 41.3  
 Female 78 34.4 303 42.0 354 58.7  
Age        0.000
 Under 19 7 3.1 22 3.0 50 8.3  
 20~39 96 42.3 351 43.7 370 61.3  
 40~59 117 51.5 273 37.9 162 26.9  
 Over 60 7 3.1 75 10.4 21 3.5  
Exposure characteristics       0.000
 Adjacent residents 12 5.4 126 17.6 20 3.3  
 Other residents 12 5.4 103 14.4 323 53.7  
 Workers 103 46.6 408 56.9 187 31.1  
 Firefighters 19 8.6 1 0.1 3 0.5  
 Public officials 9 4.1 8 1.1 5 0.8  
 Others 66 29.9 71 9.9 64 10.6  
Time of hospital visit       0.000
 Within 3 days 37 16.3 25 3.5 8 1.3  
 4 days or after 190 83.7 696 96.5 595 98.7  
Abnormal physical findings       
 Throat 72/136 52.9 273/466 58.6 204/400 51.0 0.240
 Nose 10/80 12.5 25/248 10.1 16/223 7.2 0.126
 Eye 12/82 14.6 35/250 14.0 25/242 10.3 0.202
 Lung 7/95 7.4 8/326 2.5 3/303 1.0 0.001
 Heart 0/92 0.0 0/294 0.0 0/292 0.0 -
 Skin 7/72 9.7 15/225 6.7 8/229 3.5 0.002
Abnormal PFT        
 FVC% 2/14 14.3 1/27 3.7 1/7 14.3 0.739
 FEV1/FVC% 0/14 0.0 2/27 7.4 0/7 0.0 0.747
  1. * Chi-squared test for trend.
  2. Decreased FVC < 80%.
  3. Decreased FVC/FEV1 ratio <70%.