Table 1 Distribution of study-specific characteristics of lung cancer cases and healthy controls

From: The LLP risk model: an individual risk prediction model for lung cancer

  Cases Controls  
Variable No. % No. % P -value*
Gender
 Male 357 61.7 713 61.6 0.99
 Female 222 38.3 444 38.4  
Mean age (years; mean±s.d.a) 66.4±9.1 66.3±9.0 0.93
Smoking duration
 Never 27 4.7 335 29.0 <0.0001
 1–19 years 43 7.4 236 20.4  
 20–39 years 157 27.1 337 29.1  
 40–59 years 321 55.4 234 20.2  
60 years 31 5.4 15 1.3  
Prior diagnosis of pneumonia b
 No 361 62.3 989 85.5 0.001
 Yes 104 18.0 168 14.5  
Occupational exposure to asbestos
 No 287 64.9 664 76.3 <0.0001
 Yes 155 35.1 206 23.7  
Prior diagnosis of malignant tumour
 No 509 87.6 1091 94.3 <0.0001
 Yes 72 12.4 66 5.7  
Family history of lung cancer
 No 456 78.8 947 82.0 0.04
 Early onset (<60 years) 46 7.9 62 5.4  
 Late onset (60 years) 77 13.3 148 12.8  
  1. *P values were derived from univariate conditional logistic regression.
  2. as.d.
  3. bNumbers do not add up to total due to missing data.