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Table 1.

Characteristics of the study population

VariableCases (n = 432)Controls (n = 432)
Age (y) 61.6 ± 9.0 60.9 ± 9.3 
Sex   
    Male 352 (81.5)* 352 (81.5) 
    Female 80 (18.5) 80 (18.5) 
Smoking status   
    Current 317 (73.4) 229 (53.0) 
    Former 39 (9.0) 98 (22.7) 
    Never 76 (17.6) 105 (24.3) 
Pack-years 39.9 ± 17.9 34.4 ± 17.6 
VariableCases (n = 432)Controls (n = 432)
Age (y) 61.6 ± 9.0 60.9 ± 9.3 
Sex   
    Male 352 (81.5)* 352 (81.5) 
    Female 80 (18.5) 80 (18.5) 
Smoking status   
    Current 317 (73.4) 229 (53.0) 
    Former 39 (9.0) 98 (22.7) 
    Never 76 (17.6) 105 (24.3) 
Pack-years 39.9 ± 17.9 34.4 ± 17.6 
*

Column percentage in brackets.

P = 0.001.

In current and former smokers (P < 0.001).

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