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Table 4 Odds ratios of lung cancer, overall and by histologic subtype, in Asturias' two main hospital catchment areas, by exposure category

From: Lung cancer risk and pollution in an industrial region of Northern Spain: a hospital-based case-control study

  Total Squamous cell carcinoma Adenocarcinoma Small cell carcinoma
  Controls Cases OR (95%CI)a P-valueb Cases OR (95%CI)a P-valueb Cases OR (95%CI)a P-valueb Cases OR (95%CI)a P-valueb
  N N    N    N    N   
Gijon              
   Unexposed 248 211 Reference   80 Reference   75 Reference   36 Reference  
   Industrial 36 41 1.51 (0.85-2.66)   15 1.57 (0.73-3.39)   13 1.01 (0.46-2.21)   10 2.17 (0.86-5.46)  
   Urban 36 55 2.17 (1.25-3.76)   22 3.07 (1.42-6.60)   19 2.01 (1.00-4.05)   6 1.51 (0.52-4.37)  
   Semi-urban 35 48 1.66 (0.94-2.92) 0.017 19 1.91 (0.90-4.03) 0.018 16 1.53 (0.72-3.22) 0.218 10 2.01 (0.81-5.03) 0.237
Aviles              
   Unexposed 122 126 Reference   51 Reference   25 Reference   25 Reference  
   Industrial 18 28 0.96 (0.45-2.06)   6 0.50 (0.16-1.58)   11 2.12 (0.80-5.65)   6 0.85 (0.25-2.86)  
   Urban 18 13 0.95 (0.38-2.34)   6 0.88 (0.26-3.03)   6 1.70 (0.50-5.79)   0 -  
   Semi-urban 18 9 0.56 (0.22-1.45) 0.693 1 0.19 (0.02-1.60) 0.214 3 1.05 (0.25-4.33) 0.453 2 0.63 (0.11-3.69) 0.238
  1. aORs were estimated from a multiple logistic regression model that included age, sex, tobacco consumption, family history of cancer, and occupation
  2. bP-value for the whole effect of outdoor exposure