Table 7 Relative risks (95 CI) for lung cancer by histological type, from the polytomous logistic regression model 2 comparing risks associated with current and former smoking, Nurses’ Health Study, 1976–2002: relative risks corresponding with 5, 10 and 15 years of smoking duration*
Histological typeYears of smoking duration
5 years10 years15 years
Squamous cell carcinoma1.58 (1.43 to 1.75)2.50 (2.04 to 3.06)3.95 (2.91 to 5.36)
Small cell carcinoma1.73 (1.54 to 1.94)2.98 (2.37 to 3.74)5.14 (3.64 to 7.25)
Adenocarcinoma1.35 (1.28 to 1.42)1.82 (1.64 to 2.02)2.45 (2.10 to 2.87)
Large cell carcinoma1.42 (1.23 to 1.65)2.02 (1.51 to 2.72)2.88 (1.85 to 4.49)
  • *Age and cigarettes smoked per day included in the model.