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Table 3 Odds ratios of lung cancer, overall and by histologic subtype, in Asturias, 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   
Unexposed 437 416 Reference   171 Reference   114 Reference   74 Reference  
Industrial 63 74 1.49 (0.93-2.39)   20 0.98 (0.49-1.94)   20 1.82 (0.90-3.66)   18 2.23 (1.01-4.92)  
Urban 63 70 1.33 (0.86-2.06)   24 1.19 (0.65-2.21)   28 1.92 (1.09-3.38)   8 0.87 (0.36-2.10)  
Semi-urban 63 66 1.34 (0.86-2.07) 0.190 27 1.65 (0.92-2.97) 0.400 20 1.46 (0.78-2.72) 0.070 9 1.13 (0.50-2.58) 0.230
  1. aORs were estimated from a multiple logistic regression model that included age, sex, hospital area, tobacco consumption, family history of cancer, and occupation
  2. bP-value for the whole effect of outdoor exposure