Table 1

Distribution of selected variables between lung cancer cases and controls

CharacteristicCases (n = 482)Controls (n = 510)
Sex, n (%)
M264 (54.9)229 (45.1)
F217 (45.1)279 (54.9)
Age, mean (SD), years65.46 (10.2)61.6 (10.9)
Smoking status, n (%)
Nevera22 (4.6)155 (30.5)
Ex-smokerb257 (53.5)262 (51.6)
Current smokerc201 (41.9)91 (17.9)
Pack-years, mean (SD)57.77 (39.3)22.62 (27.3)
Cigarettes per day, mean (SD)d28.64 (17.0)15.34 (15.4)
Education, n (%)
College graduate100 (21.5)112 (22.4)
<College graduate366 (78.5)387 (77.6)
Race, n (%)
Caucasian466 (95.7)497 (97.8)
  • a Less than 0.05 pack-years in lifetime.

  • b Quit smoking at least 1 year before enrollment.

  • c Smoked at least one cigarette per day for at least 1 year or 20 packs of cigarettes or 12 ounces of tobacco in rolled cigarettes in lifetime.

  • d Cigarettes per day among smokers.