Table 5

Adjusted ORs for SCC and AC comparing current smokers with nonsmokers according to smoking duration and cpd

United StatesaJapan
ACACSCC
Hospital controls OR (95% CI)bHospital controls OR (95% CI)bCommunity controls OR (95% CI)cHospital controls OR (95% CI)bCommunity controls OR (95% CI)c
Smoking duration in years
 Nonsmokers11111
 ≤4015.1 (5.2–43.9)1.1 (0.4–2.8)2.6 (1.3–5.4)6.3 (1.2–33.4)13.1 (2.9–58.6)
 >4034.7 (14.1–85.5)3.9 (1.3–11.5)4.1 (1.9–8.6)19.3 (3.8–99.0)22.8 (5.2–99.4)
cpd
 Nonsmokers11111
 <207.0 (2.2–22.4)0.6 (0.2–1.8)1.2 (0.5–29)7.4 (1.3–42.2)10.2 (2.2–46.7)
 20–2937.3 (12.7–109.7)2.2 (0.8–5.9)2.9 (1.4–5.9)13.7 (2.5–76.2)14.1 (3.2–62.1)
 ≥3054.6 (18.8–158.4)3.3 (1.2–8.8)5.5 (2.7–11.3)31.8 (5.4–185.8)35.7 (8.1–156.5)
  • a ORs for SCC were highly unstable in the United States study population; there were no cases observed among nonsmokers and only 32 among current smokers.

  • b Reference group is current-smokers; adjusted for age, education, and hospital.

  • c Reference group is current-smokers; adjusted for age and education.