Table 1.

Participant characteristics

VariableCaucasians
African-Americans
CasesControlsPCasesControlsP
n36438095103
Age (y), mean (SD)61 (9)60 (9)0.0858 (9)58 (9)0.83
Smoking status, n (%)
    Never36 (10)194 (52)8 (8)48 (47)
    Former132 (36)119 (32)24 (25)31 (30)
    Current195 (54)64 (17)<0.000163 (66)23 (23)<0.0001
Pack-years among smokers, mean (SD)51 (30)26 (23)<0.000130 (22)23 (23)0.07
History of COPD, n (%)
    No242 (67)326 (86)72 (76)90 (87)
    Yes122 (34)54 (14)<0.000123 (24)13 (13)0.03
    Years from COPD diagnosis to NSCLC diagnosis/interview among women with COPD, mean (SD)20 (17)22 (18)0.4214 (14)18 (11)0.41
  • Abbreviations: NSCLC, non–small cell lung cancer; COPD, chronic obstructive pulmonary disease.