Table 3

Associations between passive smoking and rectal cancer in men and women

MenWomen
Cases (n)Controls (n)OR (95% CI)aCases (n)Controls (n)OR (95% CI)
Passive smoking in the home (h/wk)
 Recent
  None4936141.03374621.0
  1–1017201.0 (0.5–2.0)17290.7 (0.4–1.4)
  >1047361.5 (1.0–2.4)37381.1 (0.7–1.9)
 10 years ago
  None4635831.03004181.0
  1–1031351.1 (0.6–1.7)28420.8 (0.5–1.4)
  >1061521.3 (0.9–2.0)60641.2 (0.8–1.8)
 20 years ago
  None4075251.02583691.0
  1–1042451.2 (0.8–1.9)40610.9 (0.6–1.4)
  >10101931.3 (0.9–1.8)86971.2 (0.8–1.7)
 Long-term average
  None3895011.02353421.0
  1–10851021.0 (0.7–1.4)78951.1 (0.8–1.6)
  >1075581.5 (1.0–2.2)68831.0 (0.7–1.6)
Passive smoking outside the home (h/w)
 Recent
  None3164171.02583691.0
  1–101521791.1 (0.9–1.5)1031510.8 (0.6–1.1)
  >1077601.5 (1.0–2.2)27301.0 (0.6–1.8)
 10 years ago
  None2142891.01812431.0
  1–101852391.1 (0.8–1.4)1472020.9 (0.7–1.2)
  >101431281.4 (1.0–1.9)51690.9 (0.6–1.3)
 20 years ago
  None1351851.01381991.0
  1–101812521.0 (0.7–1.3)1542041.0 (0.8–1.4)
  >102252151.4 (1.0–1.8)891141.0 (0.7–1.5)
 Long-term average
  None1131541.01131441.0
  1–101482210.9 (0.6–1.2)1261800.9 (0.6–1.2)
  >102732701.3 (1.0–1.8)1381800.9 (0.6–1.2)
Total passive smoke (h/wk)
 Recent
  None3033981.02423161.0
  1–101421671.2 (0.9–1.5)951370.8 (0.6–1.1)
  >1099901.3 (0.9–1.8)50610.9 (0.6–1.4)
 10 years ago
  None1942371.01602211.0
  1–101752281.1 (0.8–1.5)1301790.9 (0.6–1.2)
  >101701551.5 (1.1–2.0)871100.9 (0.6–1.3)
 20 years ago
  None1151651.01191711.0
  1–101652391.0 (0.7–1.4)1241701.0 (0.7–1.4)
  >102562441.5 (1.1–2.0)1351751.0 (0.7–1.4)
 Long-term average
  None931351.0921221.0
  1–103153931.2 (0.8–1.6)1972840.8 (0.6–1.2)
  >101221131.4 (1.0–2.1)83941.0 (0.6–1.5)
 Long-term average (10 and 20 yr ago)
  None951401.0991331.0
  1–102323111.1 (0.8–1.5)1602310.8 (0.6–1.2)
  >102051951.5 (1.04–2.1)1141420.9 (0.6–1.4)
  • a Adjusted for age, physical activity level, alcohol in take, usual cigarettes smoked/day (passive smoking only), and body size.