Table 1.

Characteristics of Control Subjects and Lung Cancer Cases

ControlsCasesP
Subjects, n (%)530 (100)524 (100)
    Squamous cell carcinoma166 (31.6)
    Small cell carcinoma102 (19.5)
    Adenocarcinoma144 (27.5)
    Large cell carcinoma16 (3.1)
    Mesothelioma9 (1.7)
    Other/mixed37 (7.1)
    No information50 (9.5)
Age (y)Median (range)44 (19-79)66 (35-88)P < 0.001*
Gender, n (%)Female117 (22.1)180 (34.4)P < 0.001
Male413 (77.9)344 (65.6)
Smoking status, n (%)Never232 (43.8)31 (5.9)P < 0.001
Ever273 (51.5)312 (59.5)
No information25 (4.7)181 (34.6)
Pack-years, n272196
Median (range)11 (0.3-93)34 (6-143)P < 0.001§
  • * Student'st test.

  • Pearson χ2 analysis.

  • Smokers with information on pack-years.

  • § Wilcoxon rank sum test.