Table 3

Screening-based case-control studies of cigarette smoking and breast cancer risk

First author, study yearYears of data collectionNo. of cases/controlsAge range (yrs)Smoking frequency (cigarettes/day)Smoking duration (yrs)
ComparisonOR (95% CI)aComparisonOR (95% CI)
Delfino, 2000 (53)1996–1998113/27820–74>25 vs. never0.5 (0.2–1.4)>26 vs. never0.7 (0.3–1.6)
Bennicke, 1995 (48) b1989–1991230/301029–80+31+ vs. never1.6 (1.1–2.2)
Meara, 1989 (179)1980–1984118/11845–6915+ vs. never2.9 (1.2–7.3)
  • a OR, odds ratio; CI, confidence interval.

  • b This study examined women referred to a hospital-based department of radiology for mammography.