Table 1

Distribution of select variables by case control status

VariableCases n (%)Controls n (%)Pa
Male170 (49.9)198 (55.0)
Female171 (50.1)162 (45.0)0.173
Total341 (100)360 (100)
Mean age in years (SD)61.9 (9.4)61.4 (10.3)0.485
Smoking status
Never34 (10.0)34 (9.4)
Former171 (50.1)194 (53.9)
Current136 (39.9)132 (36.7)0.608
Mean number of cigarettes smoked/day (SD)27.3 (16.0)27.7 (16.7)0.760
Mean pack-years smoked (SD)51.8 (35.6)48.6 (35.0)0.236
Family history (% yes)b
Lung cancer54 (33.8)34 (18.1)<0.001
Any cancer233 (68.7)203 (56.9)0.001
Mean DRC (%; SD)7.8 (2.8)9.5 (4.5)<0.001
  • a Two-sided χ2 test.

  • b Data missing in five subjects.