Table 2.

Age, sex, BMI, smoking status, education level, and case histology of 398 lung cancer cases and 697 controls

Cases [n (%)]Controls [n (%)]P
Mean age*64.1 ± 9.958.3 ± 10.3<0.01
Women (%)175 (44)324 (46)0.42
Mean BMI*26.8 ± 5.027.3 ± 4.9<0.01
Smoking status (%)
    Never smokers35 (9)268 (38)<0.01
    Former smokers205 (52)291 (42)
    Current smokers108 (40)138 (20)
Pack-years*56.0 ± 38.923.5 ± 30.7<0.01
Years of education (%)
    <High school degree63 (16)30 (4)<0.01
    High school degree246 (62)392 (56)
    College degree59 (15)167 (24)
    Postgraduate degree30 (8)108 (15)
Histology (%)
    Adenocarcinoma151 (38)
    Squamous cell carcinoma100 (27)
    Non–small-cell carcinoma69 (17)
    Small-cell carcinoma39 (10)
    Large-cell carcinoma24 (6)
    Mixed histology/other15 (4)
  • * Mean ± SD.