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Table 1

Distributions of select characteristics by case-control status

VariableCases (n = 456) n (%)Controls (n = 451) n (%)P
Gender    
 Male 249 (54.61) 248 (54.99)  
 Female 207 (45.39) 203 (45.01) 0.908 
Age (yrs), mean (SD) 62.00 (9.30) 62.12 (9.22) 0.909 
Smoking status    
 Never 46 (10.09) 42 (9.31)  
 Former 234 (51.32) 234 (51.89)  
 Current 176 (38.60) 175 (38.80) 0.925 
No. of cigarettes/day,a mean (SD) 28.88 (13.05) 28.96 (14.55) 0.494 
Pack-years,a mean (SD) 52.48 (30.29) 50.49 (30.87) 0.134 
VariableCases (n = 456) n (%)Controls (n = 451) n (%)P
Gender    
 Male 249 (54.61) 248 (54.99)  
 Female 207 (45.39) 203 (45.01) 0.908 
Age (yrs), mean (SD) 62.00 (9.30) 62.12 (9.22) 0.909 
Smoking status    
 Never 46 (10.09) 42 (9.31)  
 Former 234 (51.32) 234 (51.89)  
 Current 176 (38.60) 175 (38.80) 0.925 
No. of cigarettes/day,a mean (SD) 28.88 (13.05) 28.96 (14.55) 0.494 
Pack-years,a mean (SD) 52.48 (30.29) 50.49 (30.87) 0.134 
a

Cigarettes/day and pack-years are for ever-smokers.

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