Table 1.

Demographic characteristics of cases and controls

CharacteristicCases (n = 635)Controls (n = 1,300)
Age (y), mean ± SD
    Males45.4 ± 4.145.2 ± 4.3
    Females44.7 ± 4.644.7 ± 4.7
Gender, n (%)
    Male406 (64)819 (63)
    Female229 (36)481 (37)
Smoking status, n (%)
    Male
        Never smoker12 (3)243 (30)
        Former smoker69 (17)249 (30)
        Current smoker322 (79)325 (40)
        Unknown3 (1)1 (0)
    Female
        Never smoker29 (13)207 (43)
        Former smoker41 (18)128 (27)
        Current smoker158 (69)147 (30)
        Unknown1 (0)
Smoking categories (male + female), n (%)
    Weak smokers (<20 pack-years)168 (26)885 (68)
    Strong smokers (≥20 pack-years)452 (71)385 (30)
    Unknown15 (2)30 (2)
Histology, n (%)
    AC222 (35)
    SCLC153 (24)
    Other NSCLC218 (34)
    Other LC42 (7)
  • NOTE: Categorical and quantitative variables are reported in absolute and relative frequencies. Metric variables are reported as mean ± SD. Other NSCLC, other non–small-cell lung cancers, excluding adenocarcinoma.

    Abbreviations: AC, adenocarcinoma; SCLC, small-cell lung cancer; NSCLC, non–small-cell lung cancer; LC, lung cancer.