Table 5.

Association between involuntary smoking and UADT cancer, overall and by cancer subsite

UADTOral cavity and oropharynxLarynx and hypopharynxEsophagus
CasesControlsOR (95% CI)CasesControlsOR (95% CI)CasesControlsOR (95% CI)CasesControlsOR (95% CI)
Passive smoking exposure
    Never392121.00212121.0072121.0091981.00
    Ever at home only541821.49 (0.90-2.48)361821.72 (0.91-3.22)91822.01 (0.66-6.14)61640.68 (0.19-2.46)
    Ever at work only351221.79 (1.03-3.13)251222.46 (1.24-4.87)71221.72 (0.55-5.44)31110.96 (0.21-4.33)
    Ever both at home and at work521901.68 (1.00-2.83)291901.62 (0.84-3.14)111902.34 (0.74-7.40)61510.74 (0.21-2.68)
    Ever at home or work1414941.63 (1.06-2.51)904941.87 (1.08-3.23)274941.98 (0.77-5.07)154260.76 (0.27-2.12)
Duration of exposure at home (y)
    Never753381.00463381.00143381.00133131.00
    1-15261040.98 (0.56-1.69)141040.80 (0.40-1.62)71042.00 (0.67-5.96)1950.15 (0.01-1.68)
    >15661911.50 (0.97-2.32)441911.50 (0.89-2.53)91911.68 (0.62-4.52)101681.28 (0.43-3.78)
    Ptrend0.0730.1330.2690.661
Duration of exposure at work (y)
    Never923921.00563921.00163921.00153601.00
    1-15341371.14 (0.70-1.86)201371.04 (0.56-1.93)81371.86 (0.70-4.93)41161.00 (0.27-3.67)
    >15521741.65 (1.06-2.57)331741.92 (1.12-3.28)101741.18 (0.47-2.97)51450.97 (0.28-3.40)
    Ptrend0.0290.0250.6240.964
Duration of exposure both at home and at work (y)
    Never392121.00212121.0072121.0091981.00
    1-15351441.31 (0.75-2.28)221441.38 (0.68-2.78)91442.38 (0.78-7.30)11270.15 (0.02-1.44)
    >151013201.84 (1.17-2.89)643202.15 (1.21-3.80)173201.82 (0.67-4.92)142771.11 (0.39-3.14)
    Ptrend0.0070.0070.3130.635

NOTE: Adjusted by age, sex, education, center, alcohol drinking intensity, and duration (categorical).