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Table 1 Characteristics of the 103 lung cancer patients and 265 controls.

From: CYP1A1gene polymorphisms increase lung cancer risk in a high-incidence region of Spain: a case control study

  Cases, N (%) Controls, N pvalue
Smoking status    < 0.001 ξ
   Never 6 (5.8) 69 (26.1)  
   Former 36 (34.9) 128 (48.2)  
   Current 61 (59.2) 68 (25.7)  
Pack-years (PY) 61.2 ± 28.5 29.9 ± 21.4 < 0.001
Current and Former Smoking    < 0.001 ξ
   Moderate (≤50 PY) 30 (29.1) 137 (51.8)  
   Heavy (>50 PY) 67 (65) 59 (22.1)  
Family history of tumours    < 0.001 ξ
   Yes 47 (45.6) 66 (24.9)  
   No 56 (54.4) 199 (75.1)  
Histological tumour type    
   Squamous cell carcinoma 49 (47.6)   
   Large cell carcinoma 23 (22.3)   
   Adenocarcinoma 16 (15.5)   
   Small cell carcinoma 15 (14.6)   
  1. * Plus-minus values are means ± standard deviation. Because of rounding, percentages may not total 100.
  2. Student's t test.
  3. ξ Pearson's χ2 analysis.
  4. γFirst-degree family.